Add enabled git access protocol option to groups
What does this MR do and why?
Describe in detail what your merge request does and why.
Adds support for configuring git access protocols at the group level. Currently this only works on the root group and not descendants, but this could be updated in future if required.
Closes https://gitlab.com/gitlab-org/gitlab/-/issues/364840
Feature flag
The group setting is hidden behind the group_level_git_protocol_control
feature flag. This is to aid in rolling out this change and will be removed quickly afterwards.
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When instance setting isn't configured
Field disabled when instance setting is configured
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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