[BUG][Remote Segment Store] On failover, new primary uploads all the segments to remote store, it should be incremental

[sachinpkale]

Describe the bug
When remote store is enabled for an index, on fail-over, expected behavior is, new primary will start uploading new segments (which are not already uploaded by old primary) to the remote segment store. Currently, all the segments from new primary are getting uploaded.

This happens when RemoteSegmentStoreDirectory is having stale state of uploaded segments.
Solution: Call RemoteSegmentStoreDirectory.init() on failover.