feat(bus): admin Pause/Resume on loopback listener

[Flo4604]

What does this PR do?

Fixes # (issue)

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• Test A
• Test B

Checklist

Required

• Filled out the "How to test" section in this PR
• Read Contributing Guide
• Self-reviewed my own code
• Commented on my code in hard-to-understand areas
• Ran pnpm build
• Ran pnpm fmt
• Ran make fmt on /go directory
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Unkey Docs if changes were necessary

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[Flo4604]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• chore: delete pkg/cluster, proto/cluster, WAN gossip fields #6177
• chore(metrics): drop pkg/cache/clustering/metrics #6176
• feat(bus): admin Pause/Resume on loopback listener #6175 👈 (View in Graphite)
• feat(svc): wire bus.New in api and frontline run.go #6174
• feat(cache): collapse pkg/cache/clustering onto pkg/bus #6173
• feat(bus): replay-on-join via Serf query #6172
• feat(bus): add Serf-backed Bus implementation #6171
• feat(bus): add pkg/bus skeleton and Bus interface #6170
• feat: gossip rfc #6050
• main

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