[Refactor] Consolidate duplicate test utilities for maintainability

[Tomlord1122]

Why are these changes needed?

This PR refactors test support files to eliminate code duplication and improve maintainability by consolidating common utility functions.

Files Modified:
• ‎ray-operator/test/e2eautoscaler/support.go
• ‎ray-operator/test/e2erayservice/support.go
• ‎ray-operator/test/e2eautoscaler/raycluster_autoscaler_test.go
• ‎ray-operator/test/e2eautoscaler/raycluster_autoscaler_part2_test.go
• ‎ray-operator/test/e2erayservice/rayservice_ha_test.go

Main Improvements:

1. Consolidated generic utility functions (‎option[T], ‎apply[T], ‎options[T]) to use existing implementations in ‎test/support/support.go
2. Eliminated duplicate ConfigMap helper functions (‎configMapWith, ‎file, ‎files, ‎mountConfigMap)
3. Updated function calls to use capitalized versions from the support package
4. Preserved package-specific behavior (ConfigMap naming) while removing duplication

Solution Details:

Before:

// Duplicated in both e2eautoscaler and e2erayservice
type option[T any] func(t *T) *T
func apply[T any](t *T, options ...option[T]) *T { /* ... */ }
func files(t Test, fileNames ...string) option[...] { /* ... */ }

After:

// Uses existing functions from test/support package
Files(test, "file1.py", "file2.py")
Apply(config, MountConfigMap[Type](cm, "/path"))

Related issue number

Closes #3947

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[Tomlord1122]

@Future-Outlier PTAL

[EagleLo]

LGTM! Suggestion: Consider a more concise PR title like "Refactor: Consolidate duplicate test utility functions" for clarity. The CI failure appears to be a flaky test unrelated to your changes.