[7.x] Make DataStreamsSnapshotsIT resilient to failures because of local time. #73522
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Backport #73516 to 7.x branch.
Backing index names contain a date component.
Instead of defining what the expected backing index names are before creating the data streams,
resolve these expected backing index names after the data streams are created.
This way we avoid failures that can occur around midnight (local time), where the expected
names are created before midnight and the data streams are created after midnight.
Closes #73510