[Fleet] Repro backing index is overlaping with backing index

[nchaulet]

Summary

Reproduction for the following error when upgrading an integration

\t\tillegal_argument_exception: backing index [.ds-metrics-no_tsdb_to_tsdb.test-default-2024.09.20-000002] with range [2024-09-19T22:49:57.000Z TO 2024-09-20T01:19:57.000Z] is overlapping with backing index [.ds-metrics-no_tsdb_to_tsdb.test-default-2024.09.20-000005] with range [2024-09-19T22:50:04.000Z TO 2024-09-20T01:20:04.000Z]

When the upgrade to TSDB for a datastream do not succeed and we rollback to a non TDSB version, the following upgrades are not working

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