Enabling the execution of JNI tests as a component of gradle builds or github pull request checks

[heemin32]

The tests located in https://github.com/opensearch-project/k-NN/tree/main/jni/tests are not running as part of the build process. This omission could result in merging code that contains unresolved test failures.

[navneet1v]

I created a PR: #1553 which enabled the jni tests via gradle command. Its working in my local but on CI it is failing without providing enough logs: https://github.com/opensearch-project/k-NN/actions/runs/8318658424/job/22769651249?pr=1553

Need to deep-dive further to understand what is happening.

[jmazanec15]

@0ctopus13prime is taking it