Allow for pre-receive hook configuration through the UI

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Proposal

It would be very useful to be able to add and configure git hooks through the Web UI, rather than requiring configuration on the git repository's filesystem. This is a challenging way of configuring hooks, and leads to people not using these features.

Pre-commit hooks on the client side are nice, and a decent workaround, but we can't easily validate that these hooks have been run.

Referencing: https://docs.gitlab.com/ee/administration/server_hooks.html