Trigger RPC notifications after block commitment cache update (#10077)

* Fixup commitment-aggregation metric

* Trigger notifications after commitment-cache update

* Fixup fn name

* Add single-confirmation commitment level

* Rename to highest_confirmed_slot

* Pass commitment-cache info directly to notifications

* Use match

* Update commitment docs

* Update out of date pubsub docs

core/src/validator.rs

@@ -309,7 +309,7 @@ impl Validator {
             block_commitment_cache
                 .write()
                 .unwrap()
-                .set_get_largest_confirmed_root(bank_forks.read().unwrap().root());
+                .set_largest_confirmed_root(bank_forks.read().unwrap().root());
 
             // Park with the RPC service running, ready for inspection!
             warn!("Validator halted");