[BUG] IntegTests fail for plugins when running them on non linux machine

[AmiStrn]

As mentioned in the BUILDING.md

Please note that the limitation for integration tests is that it is only supported for builds on linux platform.

Reproduce by trying to run ./gradlew :integtest. This will result in:

> Task :integTest FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':integTest'.
> Could not resolve all files for configuration ':opensearch_distro_extracted_testclusters--integTest-0-1.0.0-beta1-'.
   > Could not resolve opensearch-distribution:opensearch:1.0.0-beta1.
     Required by:
         project :
      > Could not resolve opensearch-distribution:opensearch:1.0.0-beta1.
         > Could not get resource 'https://artifacts.opensearch.org/releases/core/opensearch/1.0.0-beta1/opensearch-1.0.0-beta1-darwin-x64.tar.gz'.
            > Could not HEAD 'https://artifacts.opensearch.org/releases/core/opensearch/1.0.0-beta1/opensearch-1.0.0-beta1-darwin-x64.tar.gz'. Received status code 403 from server: Forbidden

Tested the Asynchronous search integtests on:

• macOS BigSur
• version 11.2.1

---

Although it is mentioned that this is expected behavior I do think this is a bug, and should not be a caveat.

[saratvemulapalli]

Thanks @AmiStrn for this. Unfortunately workaround is the only way until opensearch-build supports other platforms.
Ref: opensearch-project/opensearch-build#38

[saratvemulapalli]

Closing this in favor of the master issue.