[GenAi] Enable the Default LLM Setting feature flag by default <9.1 (#238986)

## Summary

Summarize your PR. If it involves visual changes include a screenshot or
gif. Related: #238982

Enables the new Default LLM setting by default.

The feature flag will be cleaned up in the future.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [X] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)
- [X]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [X] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [X] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [X] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [X] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [X] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
- [X] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.

### Identify risks

Does this PR introduce any risks? For example, consider risks like hard
to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [ ] [See some risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
- [ ] ...

---------

Co-authored-by: kibanamachine <[email protected]>

Author: KDKHD

x-pack/platform/packages/shared/ai-assistant-default-llm-setting/src/components/default_ai_connector.tsx

@@ -33,9 +33,13 @@ import { i18n } from '@kbn/i18n';
 import { NO_DEFAULT_CONNECTOR } from '../lib/constants';
 import { useDefaultAiConnectorSettingContext } from '../context/default_ai_connector_context';
 
+/** Feature flag for the default AI connector setting */
 export const AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED =
   'aiAssistant.defaultLlmSettingEnabled' as const;
 
+/** The default value for the default AI connector setting */
+export const AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE = true as const;
+
 interface ConnectorData {
   connectors?: Array<{
     id: string;
@@ -272,7 +276,12 @@ export const DefaultAIConnector: React.FC<Props> = ({ connectors, settings }) =>
     );
   }, [elasticManagedLlmExists, application, docLinks]);
 
-  if (!featureFlags.getBooleanValue(AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED, false)) {
+  if (
+    !featureFlags.getBooleanValue(
+      AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
+      AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE
+    )
+  ) {
     return null;
   }
 

x-pack/solutions/security/plugins/security_solution/common/constants.ts

@@ -178,6 +178,9 @@ export const DEFAULT_AI_CONNECTOR = 'securitySolution:defaultAIConnector' as con
 export const AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED =
   'aiAssistant.defaultLlmSettingEnabled' as const;
 
+/** The default value for the default AI connector setting */
+export const AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE = true as const;
+
 /** This Kibana Advanced Setting allows users to enable/disable querying cold and frozen data tiers in analyzer */
 export const EXCLUDE_COLD_AND_FROZEN_TIERS_IN_ANALYZER =
   'securitySolution:excludeColdAndFrozenTiersInAnalyzer' as const;

x-pack/solutions/security/plugins/security_solution/public/common/hooks/use_default_ai_connector_id.test.ts

@@ -13,6 +13,7 @@ import { getDefaultConnector } from '@kbn/elastic-assistant/impl/assistant/helpe
 import {
   AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
   DEFAULT_AI_CONNECTOR,
+  AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE,
 } from '../../../common/constants';
 
 jest.mock('../lib/kibana');
@@ -96,7 +97,7 @@ describe('useDefaultAIConnectorId', () => {
 
     expect(mockFeatureFlags.getBooleanValue).toHaveBeenCalledWith(
       AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
-      false
+      AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE
     );
   });
 

x-pack/solutions/security/plugins/security_solution/public/common/hooks/use_default_ai_connector_id.ts

@@ -9,6 +9,7 @@ import { getDefaultConnector } from '@kbn/elastic-assistant/impl/assistant/helpe
 import { useMemo } from 'react';
 import {
   AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
+  AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE,
   DEFAULT_AI_CONNECTOR,
 } from '../../../common/constants';
 import { useAIConnectors } from './use_ai_connectors';
@@ -21,7 +22,7 @@ export const useDefaultAIConnectorId = () => {
   const legacyDefaultConnectorId = uiSettings.get<string>(DEFAULT_AI_CONNECTOR);
   const useNewDefaultConnector = featureFlags.getBooleanValue(
     AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
-    false
+    AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE
   );
   const newDefaultConnectorId = getDefaultConnector(connectors, settings)?.id;
 

x-pack/solutions/security/plugins/security_solution/public/flyout/ai_for_soc/components/connector_missing_callout.tsx

@@ -10,7 +10,10 @@ import { EuiCallOut, EuiLink } from '@elastic/eui';
 import { useNavigateTo } from '@kbn/security-solution-navigation';
 import { i18n } from '@kbn/i18n';
 import { useKibana } from '../../../common/lib/kibana';
-import { AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED } from '../../../../common/constants';
+import {
+  AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
+  AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE,
+} from '../../../../common/constants';
 
 const MISSING_CONNECTOR = i18n.translate('xpack.securitySolution.alertSummary.missingConnector', {
   defaultMessage: 'Missing connector',
@@ -56,7 +59,7 @@ export const ConnectorMissingCallout = memo(
     const { featureFlags } = useKibana().services;
     const useNewDefaultConnector = featureFlags.getBooleanValue(
       AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED,
-      false
+      AI_ASSISTANT_DEFAULT_LLM_SETTING_ENABLED_VALUE
     );
     const { navigateTo } = useNavigateTo();
     const goToKibanaSettings = useCallback(