In this commit, we:
 - Removed the catalogCacheIndexMaxEntries server parameter. This parameter was never documented because the indexCache was never enabled in production.
 - Removed `CatalogCache.numIndexEntries` field from server status output. Since the index cache was never enabled in production this field has always been 0.

Description of Linked Ticket

This cache was introduced in SPM-2583 and has never been enabled in production code.

In SPM-3865 we did only a partial cleanup of this code.