Rollup merge of #137701 - cuviper:sharded-hashtable, r=fmease

Convert `ShardedHashMap` to use `hashbrown::HashTable`

The `hash_raw_entry` feature (#56167) has finished fcp-close, so the compiler
should stop using it to allow its removal. Several `Sharded` maps were
using raw entries to avoid re-hashing between shard and map lookup, and
we can do that with `hashbrown::HashTable` instead.

Author: matthiaskrgr