[8.13](backport #3693) [Alerting] Add list of action variables to Observability alerting docs #3702
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This PR adds a list of valid action variables to the following alerting rules for stateful:
Adds changes to the stateful docs for issue #3658. These updates will need to be ported to the serverless docs, too.
In a follow-on PR, we should add examples to the variable descriptions, but that's out-of-scope for this PR. Tracked here: #3622
Notes
The following rules were not updated because they appear in the Uptime app, which is not visible in Kibana by default. Should we update these rules to include action variable lists or are the rules going away?
The following rules were not updated for this PR because they appear in other guides (not the Observability Guide). They will need to be updated in follow-on PRs. There is an unverified spreadsheet here that shows which variables are valid for each rule type:
For reference, here is the full list of rules that users see when they click Create rule in the Alerts UI.
This is an automatic backport of pull request #3693 done by [Mergify](https://mergify.com).