feat: Add deploy_key_id support to gitlab_tag_protection resource

Yuganrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:feature/6672-add-deploy-key-id-tag-protection into main
  • Add deploy_key_id field to allowed_to_create block schema
  • Update ExactlyOneOf validation to include deploy_key_id
  • Add DeployKeyId to gitlabTagProtectionAllowedToObjectModel struct
  • Implement deploy_key_id handling in Create and Read operations
  • Add comprehensive tests for deploy_key_id functionality
  • Add validation tests for mutual exclusivity with user_id, group_id, and access_level
  • Add AddDeployKey helper function to testutil package

Closes #6672 (closed)

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