feat: Add gitlab_group_integration_mattermost resource

Hamza Hassanainrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:feat/group-integraion-mattermost into main

What does this MR do?

Adds a new resource gitlab_group_integration_mattermost

Related issues

Closes #6715 (closed)

Implementation details

  • Resource: Implements gitlab_group_integration_mattermost resource
  • Tests: Adds acceptance tests covering Create, Read, Update, and Import
  • Documentation: Generates resource documentation
  • Examples: Adds import script and resource configuration examples

Edited by Hamza Hassanain

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