Breaking changes: removal of various deprecated fields/resources in 19.0
For collating all breaking changes in the 19.0 release.
Remove the following resource names kept for backwards compatibility:
- gitlab_integration_custom_issue_tracker
- gitlab_integration_harbor
- gitlab_integration_jenkins
- gitlab_integration_redmine
- gitlab_integration_telegram
- gitlab_label
- gitlab_integration_emails_on_push
- gitlab_integration_external_wiki
- gitlab_integration_jira
- gitlab_integration_mattermost
- gitlab_integration_mattermost
- gitlab_integration_pipelines_email
- gitlab_integration_github
Remove the following resources (if definitely being removed from GitLab):
- gitlab_group_cluster
- gitlab_instance_cluster
- gitlab_project_cluster
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