Add SAML group memberships lock setting to Terraform provider

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Description

The GitLab Terraform provider is missing support for the SAML group memberships lock setting available at the global level in GitLab.

Related Documentation

Expected Behavior

Users should be able to configure the SAML group memberships lock setting via Terraform at the global/instance level, similar to other application settings.

Acceptance Criteria

  • Add support for lock_memberships_to_saml or equivalent setting to the Terraform provider
  • Setting should be configurable at the global/instance level
  • Documentation should be updated to reflect the new setting

Implementation Guide

  • Follow the CONTRIBUTING.md guide for setting up your local development environment.
  • Clone the community fork of this project.
  • Add a new attribute called lock_memberships_to_saml to internal/provider/sdk/schema_gitlab_application_settings.go. Look at the existing attribute local_markdown_version to see where it needs to go.
  • Update any relevant tests.
Edited by Mohamed Mongy