refactor: migrate pipeline_trigger to Framework

Relates to #6791 (closed)

Changes

This MR completes the migration of the gitlab_pipeline_trigger resource from Terraform Plugin SDK to Terraform Plugin Framework.

✅ Task 1: Created Framework Resource Implementation

File: internal/provider/resource_gitlab_pipeline_trigger.go

Key features implemented:

• Resource struct with GitLab client
• Resource model with fields: ID, Project, Description, PipelineTriggerId, Token
• Metadata function setting TypeName to gitlab_pipeline_trigger
• Schema with proper attributes:
  • id - Computed with UseStateForUnknown
  • project - Required with RequiresReplace
  • description - Required
  • pipeline_trigger_id - Computed with UseStateForUnknown
  • token - Computed, Sensitive with UseStateForUnknown
• CRUD operations:
  • Create: Uses AddPipelineTrigger API, sets ID in BuildTwoPartID format
  • Read: Uses GetPipelineTrigger API with 404 handling
  • Update: Uses EditPipelineTrigger API
  • Delete: Uses DeletePipelineTrigger API
• Import using ImportStatePassthroughID
• Helper function modelToStateModel for mapping API response to state
• Registration via init function

✅ Task 2: Created Comprehensive Test Suite

File: internal/provider/resource_gitlab_pipeline_trigger_test.go

Implemented tests:

1. TestAccGitlabPipelineTrigger_basic - 6 steps:

   • Create with description "External Pipeline Trigger"
   • Import verification (excluding token)
   • Update to "Trigger"
   • Import verification
   • Update back to "External Pipeline Trigger"
   • Import verification

2. TestAccGitlabPipelineTrigger_migrateFromSDKToFramework - 3 steps:

   • Create with SDK provider v18.8.1
   • Migrate to Framework provider
   • Import verification with Framework provider

3. testAccCheckGitlabPipelineTriggerDestroy - Destroy check function verifying 404 response

All tests use:

• testutil.CreateProject(t) for test project creation
• testAccProtoV6ProviderFactories for Framework provider
• Proper import state verification excluding sensitive token field

✅ Task 3: Updated SDK Resource File

File: internal/provider/sdk/resource_gitlab_pipeline_trigger.go

Replaced entire contents with migration comment indicating the resource has been migrated to Framework and the file should be deleted.

✅ Task 4: Updated SDK Test File

File: internal/provider/sdk/resource_gitlab_pipeline_trigger_test.go

Replaced entire contents with migration comment indicating tests have been migrated to Framework and the file should be deleted.

Implementation Highlights

The migration follows best practices from the reference implementation:

• Uses Terraform Plugin Framework (not SDK)
• Maintains backward compatibility with two-part ID format <project>:<pipeline-trigger-id>
• Properly handles sensitive token field (computed, sensitive, excluded from import)
• Includes comprehensive lifecycle testing with multiple update cycles
• Includes SDK-to-Framework migration test
• Uses proper error handling with 404 detection for Read operation
• Follows the project's coding patterns and conventions

Testing

Before merging, please run:

make reviewable
make testacc RUN=TestAccGitlabPipelineTrigger