v1.17: disables turbine and repair QUIC endpoints on mainnet-beta (backport of #34523)

[mergify]

This is an automatic backport of pull request #34523 done by Mergify.
Cherry-pick of 4feadbd has failed:

On branch mergify/bp/v1.17/pr-34523
Your branch is up to date with 'origin/v1.17'.

You are currently cherry-picking commit 4feadbdb7c.
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Unmerged paths:
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	both modified:   core/src/validator.rs

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[willhickey]

Approved for v1.17 backport