Migrate ES Query tests to deployment agnostic solution

[mgiota]

Part of https://github.com/elastic/kibana/issues/183263

🍒 Summary

As part of this PR we introduce a way to write deployment agnostic tests using Mocha tagging. Tests should be written in the new observability_solution_api_integration folder and should be tagged with the @ess and @serverless tags.

describe('@ess @serverless ES query rule, () => {
  describe('Create rule', () => { 
  });
}

Existing tests

Test	Type	ESS	Serverless	Notes
ES query rule type	Alerting	❌	✅	ESS: x-pack/test_serverless/api_integration/test_suites/observability/es_query_rule

New folder structure

How to migrate

1. create a new es_query folder within alerting folder
2. move es_query rule tests there
3. Create serverless.config.ts and ess.config.ts files similar to the burn_rate rule in this PR
4. Add the new config files in .buildkite/ftr_configs.yml
5. Tag the tests with @ess @serverless tags
6. create 2 script commands in the package.json of the observability_solution_api_integration folder similar to the burn_rate commands.
7. For ESS
   • start the server using your new alias alerting_es_query:server:ess
   • start the test runner using the new alias alerting_es_query:runner:ess
8. For Serverless
   • start the server using your new alias alerting_es_query:server:serverless
   • start the test runner using the new alias alerting_es_query:runner:serverless

[maryam-saeidi]

Moved to backlog until the related Meta ticket is prioritized.