[Remote Store] Reject Resize index requests. (i.e, split, shrink and clone), While DocRep to SegRep migration is in progress.

[astute-decipher]

Is your feature request related to a problem? Please describe

We want to disallow some APIs' which are involved in Index resizing and shard relocation, when Document-Replication type to Segment-Replication type migration is happening.

Describe the solution you'd like

Resize requests are :

1. Always allowed if source Index setting/metadata has SETTING_REMOTE_STORE_ENABLED as true.
2. Disallowed If cluster settings has REMOTE_STORE_COMPATIBILITY_MODE_SETTING as MIXED and MIGRATION_DIRECTION_SETTING as REMOTE_STORE and Condition 1 is not met.

Related component

Storage:Remote

Describe alternatives you've considered

No response

Additional context

No response