BF-37470 contains an instance of an unexpected result for an explain query in a sharded cluster.
The test assumes a specific value (4) in the nWouldDelete field in the explain results, but the actual return value was 0.

The explain result also contained the executionSuccess: false value for at least one of the shards, meaning that the explain did not execute successfully on the shard and its results can be incomplete.

gregory.noma@mongodb.com already added a retry mechanism for some explain commands to jstests/libs/override_methods/network_error_and_txn_override.js in SERVER-103057, which potentially helps all those tests that are using this override.

The test that failed in BF-37470 timeseries_explain_delete.js however uses a different override, jstests/libs/override_methods/implicitly_retry_on_migration_in_progress.js, which does not retry an explain command if it fails on one of the shards.

We should adjust the jstests/libs/override_methods/implicitly_retry_on_migration_in_progress.js override to also retry failed explains if possible. This hopefully reduces the occurrences of similar BFs for all tests that use this override.