[FEATURE]BWC tests for restart/rolling upgrade scenario

[heemin32]

Is your feature request related to a problem?
I would like to have BWC (backward compatibility) tests for restart/rolling upgrade scenarios in ml-commons to detect any potential compatibility issues early in the process.

What solution would you like?
Having BWC test for restart/rolling upgrade scenario

What alternatives have you considered?
Identifying BWC-related errors through customer reports or errors from other plugins utilizing ml-commons.

Do you have any additional context?
A BWC issue was previously reported when upgrading from versions 2.9 and 2.10 to a newer version. #1838

The neural-search plugin has a BWC issue in the rolling upgrade scenario, where auto-redeployment is frequently failing. opensearch-project/neural-search#1035

[brianf-aws]

Hey Heemin @b4sjoo is working on a bwc test suite.