Summary:
Missing null check. `CatalogManager` is yb-masters `tserver::TabletPeerLookupIf`, so moving the inheritance to `CatalogManagerIf` and using it in `MasterTabletServer`.
The `CatalogManager` performs all the required checks correctly.

Fixes #25145
Jira: DB-14305

Test Plan: Jenkins

Reviewers: bkolagani

Reviewed By: bkolagani

Subscribers: ybase

Differential Revision: https://phorge.dev.yugabyte.com/D40405