The command `_shardsvrFetchCollMetadata` was introduced as part of the 'authoritative-collection' initiative under SERVER-101402 before the program was paused for a few months.

The goal of this command is to fetch the metadata from the config server and install it authoritatively to the targeted shard.

However, it needs to be adapted to the current way of comiting an authoritative metadata. For instance, it is not installing the metadata on the CSR, which is causing failures in test fetch_coll_metadata_command.js.

Our suggestion is to follow the same pattern that follows commitCreateCollectionLocally() or similar commands.