PRD-2505 Allow querying for specific secrets

[shreyayay]

Why is the change needed?

The API used by the java-sdk now also allows querying for specific secrets. This feature can be extended to the SDK as well.

What change has been made?

• Updated the model to also includeSecretNameFilter
• Sending the list of secret names (optionally) when fetching rendered secrets.

Other Changes:

• Dependencies on powermock have been removed as it was causing errors with JDK 17. The last published version was in 2020.
• Using junit5 instead of junit4 as the dependency on powermock is removed (PowerMock is not officially supported by JUnit 5.)
• Updated mockito version
• Refactored test cases to also mock environments response
• Added a workflow file for build step.

Any callouts?

Previously the test suite was failing as the response for getEnvironmentsWithHttpInfo was not mocked. This has been added under a @BeforeEach setup step now.

Testing

• Verified in a test project that the secrets can be filtered when using the SDK

Self-Checklist

• The changes are supported by test cases
• The changes have been tested in a dev env

[georgeshanti]

Everything looks good to me 💯