In the test, we assume the trimming of osdmaps is done if osdmap_first_committed is equal to the epoch of the map upto which we had to trim. osdmap_first_committed however returns the value of cached_first_committed which is updated before the Paxos proposal for trim goes through. Normally, this is not a problem as when a refresh() happens, cached_first_committed will be corrected to the value before the trim was proposed if the Paxos proposal failed. But for this test, we encounter a failure in this case as the osdmap_first_committed will not be equal to the osdmap_manifest.first_pinned as the trim never went through. Changing the test to verify that osdmap_manifest.first_pinned has changed to the correct value is a better way to signify that the trim is complete for the purpose of this test.

Fixes: https://tracker.ceph.com/issues/47838

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