refactor(anta): Change TestStatus to be an Enum for coding clarity

[gmuloc]

Description

In #740 we end up doing getargs(TestStatus) on a Literal type which feels very awkward. This PR defines a proper type for TestStatus based on built-in Python Enum (can be made better in Python 3.11 with StrEnum)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have run pre-commit for code linting and typing (pre-commit run)
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes (tox -e testenv)

[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions[bot]]

Conflicts have been resolved. A maintainer will review the pull request shortly.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
97.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud