[META] Add BWC tests to bwc_test.py

[VachaShah]

Plugin BWC tests are introduced for AD: opensearch-project/anomaly-detection#158. Add support to wire these tests in test.py similar to integration tests.

Tasks:

P0

• Add support for running bwctest.sh #275
• Add bwctest.sh in OpenSearch and one plugin #296
• Setup maven and build dependencies using DependencyInstaller #276
• Add support for BWC tests to onboard to Test Manifest #572
• Add support for dependency installer for BWC Tests #535
• Integrate BWC test result with test publisher framework(207) #277
• Dockerize BWC test runs #278

P1

• Add support to parallelize multiple runs Implement support for the bwc tests to run in parallel for multiple plugins #243

[gaiksaya]

[Triage] We will revisit the design when someone starts looking into BWC testing.
closing this for now, We will reopen this again later if required.