Backport of fix: stop peering delete routine on leader loss into release/1.14.x #17700
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Backport
This PR is auto-generated from #17483 to be assessed for backporting due to the inclusion of the label backport/1.14.
The below text is copied from the body of the original PR.
Description
This complements an enterprise PR that resolves an issue with namespaces but also affects the leader routine. When we lose leadership, we clean up the peering deferred deletion routine.
PR Checklist
updated test coverageexternal facing docs updatedOverview of commits