[FEATURE] Enable Yaml Test Runner for Improved Test Coverage

[saimedhi]

Is your feature request related to a problem?

• Improve test coverage by enabling the Yaml test runner here and adding it to GitHub Actions.

• Please feel free to close this issue if the Yaml test runner is already running and using REST API test specifications from the OpenSearch server. Thank you.

What solution would you like?

Fix the Yaml test runner to make it work with OpenSearch REST API spec tests. Here is the link to the tests: OpenSearch REST API Spec Tests.

[dblock]

[Catch All Triage - 1, 2, 3]