Add buildpack audit events

[Samze]

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[Copilot]

Pull request overview

This pull request adds comprehensive audit event logging for buildpack lifecycle operations (create, update, and delete). The implementation follows established patterns in the codebase and ensures that all buildpack management operations are properly tracked through audit events.

Key changes:

• Added buildpack audit event recording for create, update, and delete operations
• Created a new BuildpackEventRepository following existing repository patterns
• Updated all three buildpack action classes to accept user_audit_info and record events
• Added comprehensive test coverage for the new audit events

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/repositories/buildpack_event_repository.rb	New repository implementing audit event recording methods for buildpack create, update, and delete operations
app/repositories/event_types.rb	Added three new event type constants for buildpack lifecycle events
app/actions/buildpack_create.rb	Updated to accept user_audit_info and record audit events after successful creation
app/actions/buildpack_update.rb	Updated to accept user_audit_info and record audit events after successful updates
app/actions/buildpack_delete.rb	Updated to accept user_audit_info and record audit events before deletion
app/controllers/v3/buildpacks_controller.rb	Updated to pass user_audit_info to all three action classes
spec/unit/actions/buildpack_create_spec.rb	Added test coverage for audit event creation with comprehensive assertions
spec/unit/actions/buildpack_update_spec.rb	Added test coverage for audit event updates with comprehensive assertions
spec/unit/actions/buildpack_delete_spec.rb	Added test coverage for audit event deletion with comprehensive assertions
spec/unit/repositories/event_types_spec.rb	Added buildpack event types to the expected event types list
docs/v3/source/includes/resources/audit_events/_header.md.erb	Added documentation for the new buildpack audit event types

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