[ResponseOps][Alerting] Create xpack.actions.queued.max circuit breaker (#164632)

Resolves https://github.com/elastic/kibana/issues/162264


## Summary

Adds a limit on the maximum number of actions that can be queued with a
circuit breaker. The limit in serverless is set to 10,000, and 1,000,000
in the other environments.

- If a rule execution exceeds the limit, the circuit breaker kicks in
and stops triggering actions.
- Alerting rule's status updated to warning when circuit breaker is hit

Did not update the `enqueueExecution` bc it's going to be removed in
https://github.com/elastic/kibana/pull/165120.


### Checklist

Delete any items that are not applicable to this PR.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios


### To Verify

- Create a 2 rules that have actions
- Set `xpack.actions.queued.max` in kibana.yml to a low number like 2 or
3
- Use the run soon button to queue up actions and hit the circuit
breaker.
- The actions will not be scheduled and the rule status will be set to
warning

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

docs/settings/alert-action-settings.asciidoc

@@ -227,6 +227,9 @@ xpack.actions.run:
           maxAttempts: 5
 --
 
+`xpack.actions.queued.max` {ess-icon}::
+Specifies the maximum number of actions that can be queued. Default: 1000000
+
 [float]
 [[preconfigured-connector-settings]]
 === Preconfigured connector settings