Pass GL_PROTOCOL and GL_REPOSITORY to update hook

Alejandro Rodríguezrequested to merge
update-hook-env into master

This exposes the same information that is available to the pre-receive and post-receive hooks to the update hook, so that users have a consistent data set to use in their custom hooks.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/43739

Edited by GitLab Release Tools Bot

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