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Added a new revised IT group BackwardCompatibilityMain. The idea is to catch potential backward compatibility issues that may arise during rolling upgrade. This test group runs a docker-compose cluster with Overlord & Coordinator service on the previous druid version. Following env vars are required in the GHA file .github/workflows/unit-and-integration-tests-unified.yml to run this test DRUID_PREVIOUS_VERSION -> Previous druid version to test backward incompatibility. DRUID_PREVIOUS_VERSION_DOWNLOAD_URL -> URL to fetch the tar.