Resolve "[Feature] Migrate to Ruff"

Summary

Migrate the CI Pipeline to ruff

Main ruff changes:

• Write constants in uppercase instead of lowercae
• Correct fixture use in tests
• Use f-strings instead of string.format(), expect for logging
• Use isinstance for type checking
• Iterate over a dict directly instead over dict.keys()
• Store references to dangling asyncio tasks

Explain your context

(Explain what you did.)

Please list breaking changes, new features or bugfixes

• Breaking changes:
• New features:
  • Pipeline using ruff instead of:...
• Bugfixes:

Closes #240 (closed)