[migration] to mockito v5 from v2

[kartva]

The main OpenSearch repository uses Mockito 5 while PA is currently using Mockito 2. Mockito 5 removes the need to use PowerMock, thus eliminating one of our test dependencies and contains new functionality that may be useful for writing unit tests.

This can help #69 since we will be upgrading to a more recent test framework with more features.

In particular, this file in the OpenSearch repository contains the version numbers for mockito and other packages.

[kartva]

I am working on this.

[kartva]

This issue is open to contributions.

Relevant information:

• Mockito mockStatic to replace PowerMockito.mockStatic
• Mockito mockConstruction to replace PowerMockito.whenNew.

[dblock]

[Triage -- attendees 1, 2, 3, 4, 5, 6, 7]

@DesmondWillowbrook Are you still trying to do this?

[reta]

Already done, closing