Refactor test jobs, add image cleanup and post-deploy smoke tests

Description

Please include a summary of the changes and the related issue (if applicable). Provide a clear and concise description of the problem and the solution.

Refactored test jobs to run in parallel, allowing for future scalability. Added a cleanup step to remove unused Docker images on the VM to free up storage space. Also added a post-deploy workflow to run smoke tests on the production environment. This ensures that all parts of the system are operational and provides a visual indicator of successful deployment on GitHub.

Issues # (issue-id)

Fixes #167, #164, #145.

Additional comments

None

Type of change

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation update
[x] Code quality improvements (linting, refactoring, etc.)
[ ] Other (please specify):

Checklist

[x] My code follows the style guidelines of this project (ESLint, GoLint, etc.).
[x] I have performed a self-review of my own code.
[x] 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.
[x] New and existing unit tests pass locally with my changes.
[x] I have run relevant linters (ESLint, GoLint, Qodana, etc.) and ensured that no new issues were introduced.

CEM-KEA / whoknows