feat: UNIT_TEST UDC

[kukkok3]

Description

Adding a UNIT_TEST UDC . This UDC will run unit tests and produce code coverage info using LLVM instrumentation-based coverage with the help of cargo-llvm-cov that supports nextest. The code coverage info will be printed on the stout after the test results as a support for the devs and will be also saved as an artifact to be used in CI.
Nextest will also create a test report in junit format that can be saved as artifact and used in CI.
The unit test alias and the testci alias have been removed as they will be substitute with a earthly target

Related Issue(s)

List the issue numbers related to this pull request.

e.g., Closes #123, Resolves #456 Fixes #367

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[minikin]

@kukkok3 lgtm. Feel free to merge.