Add Smoke test for neural search plugin

[weijia-aws]

Description

This PR add changes to onboard smoke test for neural-search plugin

Issues Resolved

opensearch-project/neural-search#1186

Test

./test.sh smoke-test manifests/3.0.0/opensearch-3.0.0-test.yml --component neural-search --paths opensearch=https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/3.0.0/11061/linux/x64/tar


2025-05-20 10:00:17 INFO     | neural-search        | /_cluster/settings PUT | PASS  |
2025-05-20 10:00:17 INFO     | neural-search        | /_plugins/_neural/stats GET | PASS  |
2025-05-20 10:00:17 INFO     | neural-search        | /_plugins/_neural/stats/text_embedding_executions GET | PASS  |
2025-05-20 10:00:17 INFO     | neural-search        | /_plugins/_neural/stats?flat_stat_paths=true&include_metadata=true GET | PASS  |

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[zelinh]

Hey @weijia-aws Could you rebase from main branch? We should have fixed the CI failures.

[weijia-aws]

Will do

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (b104d3c) to head (f00f146).
Report is 2 commits behind head on main.

❌ Your project status has failed because the head coverage (0.00%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #5528   +/-   ##
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