Modify unit test action to test all repository packages

[shaynafinocchiaro]

Description

PR changes the go-code-tester action to test all packages in a repository, as well as submodules.
Adds a new step "Coverage results". However, if Run unit tests and check package coverage fails because of lack of coverage, then the "coverage results" step will be skipped.

Issues

List the issues impacted by this PR:

Issue ID
dell/csm#1733

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Tested in gocsi https://github.com/shaynafinocchiaro/test-gocsi/actions/runs/12997384687/job/36255236026?pr=3
• Tested in csi-powerflex https://github.com/shaynafinocchiaro/test-csi-powerflex/actions/runs/12992269780/job/36255249422?pr=5
• Tested in csi-powermax (submodules) https://github.com/shaynafinocchiaro/test-csi-powermax/actions/runs/12936702145/job/36255341814?pr=1