Adding User Behavior Insights API tests

[jzonthemtn]

Description

Adds User Behavior Insights (UBI) smoke tests per https://github.com/opensearch-project/user-behavior-insights/issues/77.

Issues Resolved

Part of https://github.com/opensearch-project/user-behavior-insights/issues/77 but does not close it until both opensearch-api-specification#844 are merged.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 91.98%. Comparing base (f6de92b) to head (f20ddb2). :warning: Report is 237 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5407   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files         202      202           
  Lines        7052     7052           
=======================================
  Hits         6487     6487           
  Misses        565      565           

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[epugh]

Hi all, I think the UBI plugin is much better positioned to participate in release tests. I think this PR can now be merged? Since some other plugins like search-relevance have a optional dependency on ubi, it would be good to make sure this gets integrated. We can expand the smoke tests from here if needed.

[gaiksaya]

Looks like we still have UBI pending to be on-boarded to api-spec https://github.com/opensearch-project/opensearch-api-specification/pull/845 We do not have failure notifications for smoke testing in place yet but tests would fail until the PR gets in.