Deprecate old gitlab_project mirror fields

Heidi Berryrequested to merge
deprecate-old-pull-mirror into main

This update describes a new way to handle GitLab project mirroring (automatically syncing code from another repository). Previously, mirror settings were configured directly on the main project resource, but now they've been moved to a separate dedicated resource called gitlab_project_pull_mirror.

The changes include:

  • Adding migration documentation that shows users how to move from the old approach to the new one
  • Marking the old mirror-related settings as deprecated with warnings that they'll be removed in version 19.0
  • Updating all examples and documentation to show the new recommended approach
  • The migration process temporarily removes the mirror during the update, then recreates it with the new resource

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