[Console] Allow ESQL suggestions in _query/async request

[ElenaStoeva]

Follow-up to #240264

Summary

This PR fixes a small regression introduced by #240264, where ESQL suggestions are no longer displayed for _query/async endpoints and they should be.

With this change, ESQL suggesstions should be displayed for the following endpoints:

_query
/_query
_query?...
/_query?...
_query/async
/_query/async
_query/async?...
/_query/async?...

[elasticmachine]

Pinging @elastic/kibana-management (Team:Kibana Management)

[SoniaSanzV]

Thank you @ElenaStoeva! I'm sorry I didn't catch that regression in my review.

ESQL suggestions look good to me in all cases, but I found something that I don't know if it's related to this PR.

For _query request I get suggestions for the body, but not for _query/async

Once I type "query" myself, I get the suggestions as expected:

[ElenaStoeva]

Thanks for reviewing @SoniaSanzV! Yeah, I noticed that too but that's not related to the ESQL suggestions - it happens because we don't have specs for the body param autocompletions for this endpoint, while the _query endpoint does - src/platform/plugins/shared/console/server/lib/spec_definitions/json/overrides/esql.query.json.

[SoniaSanzV]

Thank you for clarification @ElenaStoeva! Approving!

[elasticmachine]

💚 Build Succeeded

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• Commit: dcb3f9b

Metrics [docs]

Async chunks

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

id	before	after	diff
console	197.8KB	197.8KB	+10.0B

Page load bundle

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

id	before	after	diff
kbnUiSharedDeps-srcJs	4.0MB	4.0MB	+10.0B

cc @ElenaStoeva