docs: clarify merge queue jump permissions

[alok-108]

Closes #46190.

Summary

Adds a section to the merge queue documentation clarifying that users need admin permissions or specific bypass permissions to jump the queue.

Verification

• Minimal surgical diff
• Zero whitespace issues

[github-actions]

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Source	Review	Production	What Changed
repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[alok-108]

Thanks for the heads-up, @souravsviswajith

[alok-108]

Thank you for the positive feedback, @souravsviswajith

[subatoi]

This isn't open to contributors yet, so I'm going to close this out. Until an issue has help wanted attached, we haven't had time to do a proper assessment and we don't know whether it's something we need to fix internally, or how many articles are affected and what the scope of the fix will be. Sorry this won't have been the outcome you were hoping for.