[ruby-core:94247] [Ruby master Misc#16094] Allow only "Rebase and merge" on GitHub and sync it on git.ruby-lang.org pre-receive hook

Issue #16094 has been reported by k0kubun (Takashi Kokubun).

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Misc #16094: Allow only "Rebase and merge" on GitHub and sync it on git.ruby-lang.org pre-receive hook
https://bugs.ruby-lang.org/issues/16094

* Author: k0kubun (Takashi Kokubun)
* Status: Open
* Priority: Normal
* Assignee: 
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## Problem
* Our pull request merge strategy confuses contributors, as described in [Misc #16093].
* In [Misc #16093], some committers did not like accepting a merge commit.

## Solution
* Allow using GitHub's "Rebase and merge" to committers, as suggested by @marcandre
  * Disable other merge modes like "Create a merge commit" and "Squash and merge" in GitHub repository settings.
  * Also prohibit pushes to the master branch which are not coming from a pull request by requiring CI in GitHub repository settings.
* Perform GitHub bidirectional sync on git.ruby-lang.org pre-receive hook, and accept a push if it does not conflict with "Rebase and merge" on GitHub.

## Notes
* Even after implementing this ticket, the Ruby's canonical Git repository will continue to be git.ruby-lang.org as is.
* All committers must push non-pull-request commits to git.ruby-lang.org. Direct pushes to GitHub will continue to be disabled.
* This approach has one drawback; `git push` to git.ruby-lang.org might block longer than now.



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