[Remote Store] Add integration tests for restore flow

[BhumikaSaini-Amazon]

Is your feature request related to a problem? Please describe.
We need to identify and add relevant scenarios to the Remote Store restore flow test suite to thoroughly validate for any bugs or gaps in the restore logic. Currently, there are some tests already added to RemoteStoreIT class. Additional configurations need to be tested.

Describe the solution you'd like

Add the following test scenarios to the suite:

• Restoring an index with >= 1 replica - 1 for each of the restore source / data loss (if any) combinations (RSS only, RSS+RTS both, flushed data, refreshed data, unrefreshed data)
• Specifying indices using wildcards.
• Excluding indices using wildcards.
• Restoring multiple indices via single request.
• Restoring only few of the red remote-enabled indices.
• Restoring an index via index alias
• TODO: what else is a good scenario to cover?

Additional context

1. Remote Store restore API: https://opensearch.org/docs/latest/tuning-your-cluster/availability-and-recovery/remote-store/index/#restoring-from-a-backup
2. Peer recovery tests are tracked separately in [Remote Store] Add integration tests for recovery flow #8476