Restore unit-tests for all microservices

[khyurri]

We need to restore unit-tests and add them into GitHub actions. Badgerdoc is going to use pytest as library to test, so all tests must be migrated to pytest. All tests must be added to GitHub actions.

• [x] annotation microservice (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]
• [x] assets microservice (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]
• [x] common libraries (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]
• [ ] ~~convert microservice (migrated to pytest, pre-commit and GitHub actions)~~
• [x] jobs microservice (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]
• [ ] ~~pipelines microservice (migrated to pytest, pre-commit and GitHub actions)~~
• [ ] ~~processing microservice (migrated to pytest, pre-commit and GitHub actions)~~
• [ ] ~~search microservice (migrated to pytest, pre-commit and GitHub actions)~~
• [x] taxonomy microservice (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]
• [x] users microservice (migrated to pytest, pre-commit and GitHub actions) [@cakeinsauce]