Create comprehensive tests for RBAC permissions and feature flag toggling to ensure proper access control and graceful degradation.

Test Coverage:

RBAC Permission Tests:
1. User without BaseImage read access:

• Mock user permissions without BaseImage resource access
• Verify "Base images" dropdown option is hidden
• Verify Details tab is hidden on Image page
• Verify Layer type filter is not shown in compound search
• Verify Layer type column is not rendered in component table
• Verify app functions normally for other features

2. User with read-only BaseImage access:

• Mock user with BaseImage READ permission only
• Verify can view Details tab
• Verify cannot access BaseImagesModal (no write permission)
• Verify can use layer type filter
• Verify can see layer type column

Feature Flag Tests:
3. Feature flag OFF (ROX_BASE_IMAGE_MANAGEMENT=false):

• Verify original "Manage watched images" button shown (not dropdown)
• Verify Details tab is not rendered on Image page
• Verify layer type filter is not available
• Verify layer type column is not shown
• Verify all other features work normally

4. Feature flag ON (ROX_BASE_IMAGE_MANAGEMENT=true):

• Verify "Manage images" dropdown with both options
• Verify Details tab is visible
• Verify layer type filter is available
• Verify layer type column is shown

Acceptance Criteria:

• RBAC correctly gates all features based on permissions
• Feature flag properly toggles all UI elements
• Graceful degradation when feature is disabled
• No console errors when features are hidden
• Tests use proper mocking techniques