[FEATURE] Add BWC suite to Main Branch.

[dhrubo-os]

Is your feature request related to a problem?

Currently we have a BWC suite in 2.x Branch: https://github.com/opensearch-project/ml-commons/blob/2.x/plugin/src/test/java/org/opensearch/ml/bwc/MLCommonsBackwardsCompatibilityIT.java

But we don't have this suite in Main Branch.

According to @b4sjoo at that time we didn't find a way to generate 3.0 artifact through Opensearch CI so main branch doesn't have BWC Suite.

Currently I can see Flow-framework has BWC suite running in Main Branch. Ref PR: https://github.com/opensearch-project/flow-framework/pull/551/files

We can also implement the same.

[brianf-aws]

@b4sjoo Can you take a look at this? Thanks