Backport of core: fix start up policy loading race condition on perf standbys into release/1.12.x #17809
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Backport
This PR is auto-generated from #17801 to be assessed for backporting due to the inclusion of the label backport/1.12.x.
The below text is copied from the body of the original PR.
This fixes a start up race condition where recently assigned performance standbys might not yet have received logs from the active node containing policies. This can sometimes result in a mount loop on the performance standbys and would only be fixed by restarting the performance standbys. The fix simply skips performance standbys all together.
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