fix: Add proper HTTP error handling to BaseAssignmentViewSet.perform_create

[hsong-rh]

https://issues.redhat.com/browse/AAP-58366

Description

• Add try-catch block around remote_sync_assignment call
• Convert HTTP 400 errors to ValidationError
• Convert HTTP 401/403 errors to PermissionDenied
• Re-raise other HTTP errors unchanged
• Add comprehensive pytest tests for all error scenarios
• Tests cover both user and team assignment error handling

🤖 Generated with Claude Code

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test update
• Refactoring (no functional changes)
• Development environment change
• Configuration change

Self-Review Checklist

• I have performed a self-review of my code
• I have added relevant comments to complex code sections
• I have updated documentation where needed
• I have considered the security impact of these changes
• I have considered performance implications
• I have thought about error handling and edge cases
• I have tested the changes in my local environment

Screenshots/Logs

2025-11-25 15:16:16,977 INFO     ansible_base.resources_api.rest_client Making post request to https://host.containers.internal:8443/api/gateway/v1/service-index/role-user-assignments/assign/.
2025-11-25 15:16:17,024 DEBUG    ansible_base.resources_api.rest_client Response status code from https://host.containers.internal:8443/api/gateway/v1/service-index/role-user-assignments/assign/: 400
2025-11-25 15:16:17,024 ERROR    [rid:af0db68c-2c11-4b55-b967-c1d7d5895245] aap_eda.api.exceptions ValidationError: {'detail': ErrorDetail(string='400 Client Error: Bad Request for url: https://host.containers.internal:8443/api/gateway/v1/service-index/role-user-assignments/assign/\nResponse content: {"role_definition":["Object with name=Organization Event Stream Admin does not exist."]}', code='invalid')}
2025-11-25 15:16:17,024 ERROR    [rid:af0db68c-2c11-4b55-b967-c1d7d5895245] aap_eda.api.exceptions /app/venv/lib64/python3.11/site-packages/ansible_base/rbac/api/views.py:239 perform_create
2025-11-25 15:16:17,024 ERROR    [rid:af0db68c-2c11-4b55-b967-c1d7d5895245] aap_eda.api.exceptions /app/venv/lib64/python3.11/site-packages/rest_framework/mixins.py:19 create
2025-11-25 15:16:17,025 ERROR    [rid:af0db68c-2c11-4b55-b967-c1d7d5895245] aap_eda.api.exceptions /app/venv/lib64/python3.11/site-packages/drf_spectacular/drainage.py:193 wrapped_method
2025-11-25 15:16:17,025 ERROR    [rid:af0db68c-2c11-4b55-b967-c1d7d5895245] aap_eda.api.exceptions /app/venv/lib64/python3.11/site-packages/rest_framework/views.py:506 dispatch
2025-11-25 15:16:17,026 WARNING  django.channels.server HTTP POST /api/eda/v1/role_user_assignments/ 400 [0.08, 10.89.2.14:44844]

[github-actions]

DVCS PR Check Results:

PR appears valid (JIRA key(s) found)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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