Add Group custom_project_templates_group_id to API

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Proposal

Add existing database field of custom_project_templates_group_id to API endpoint for /groups/:id/update

Use Case

When trying to automate a Group Custom project templates selection of a sub-group, this is only available in the Web UI and is not in the API.

I expect to find it in the Update group API endpoint, but only has file_template_project_id for the repository import rather than group of multiple projects.

Screenshots

Existing Documentation

https://docs.gitlab.com/ee/api/groups.html#update-group