Implement `mergeAllChunksOnShard` command paths

With the work done under SERVER-71612, the catalog manager will offer a method for merging all non-contiguous sequences of chunks belonging to a given shard for a given collection.

Purpose of this ticket is to create the following commands flow that will end up calling such method on the CSRS:

• `mergeAllChunksOnShard(nss, shardId)` callable on routers
• `_shardSvrMergeAllChunksOnShard(nss)` called on shards by routers
• `_configsvrCommitMergeAllChunksOnShard(nss, shardId)` called on the CSRS by shards