Run BWC tests at distribution level

[vibrantvarun]

Is your feature request related to a problem?

We have added the BWC tests for neural search on the plugin level with only necessary dependency plugins that neural search needs.

There is a framework for BWC tests on distribution level as well which will set up the test cluster with the bundle distribution including all plugins engineering effectiveness team builds.

It will be beneficial during the release cycle since we will be testing the exact distribution that we would ship to the customers.

Reference:
#202 (comment)

What solution would you like?

https://github.com/opensearch-project/anomaly-detection/pull/766/files

Do you have any additional context?

https://github.com/opensearch-project/opensearch-plugins/blob/main/TESTING.md#bwc-tests-on-distribution-bundle-level

[vibrantvarun]

Code is merged now