[RAM] Add toggle for AAD fields in alert templating

[Zacqary]

Summary

Reopen of #161213

Closes #160838

Feature can be activated via feature flag:
xpack.trigger_actions_ui.enableExperimental: ['isMustacheAutocompleteOn', 'showMustacheAutocompleteSwitch']

Checklist

• Unit or functional tests were updated or added to match the most common scenarios

[apmmachine]

🤖 GitHub comments

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[Zacqary]

Reverted making ruleTypeId a required prop to avoid triggering Security Solution codeowner

Security Solution will need to pass ruleTypeId into the action form in order to take advantage of this enhancement. Will open an issue.

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[jcger]

LGTM

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 2e424f7

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
stackConnectors	272	236	-36
triggersActionsUi	616	621	+5
total			-31

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
alerting	778	779	+1
triggersActionsUi	555	557	+2
total			+3

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
stackConnectors	556.4KB	537.4KB	-18.9KB
triggersActionsUi	1.4MB	1.4MB	+2.1KB
total			-16.9KB

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
stackConnectors	39.5KB	39.3KB	-245.0B
triggersActionsUi	97.3KB	103.9KB	+6.6KB
total			+6.4KB

Unknown metric groups

API count

id	before	after	diff
alerting	809	810	+1
triggersActionsUi	581	583	+2
total			+3

ESLint disabled line counts

id	before	after	diff
stackConnectors	104	103	-1
triggersActionsUi	126	127	+1
total			-0

Total ESLint disabled count

id	before	after	diff
stackConnectors	109	108	-1
triggersActionsUi	132	133	+1
total			-0

History

• 💔 Build #175771 failed 4382789
• 💚 Build #172347 succeeded 8d05435
• 💚 Build #172081 succeeded 2d8ac7a
• 💔 Build #172072 failed 905b8d4
• 💔 Build #171999 failed 5feab9d

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