list/update worker countries from backend api

[elfkuzco]

Changes

• add endpoints for worker to list/update countries

[elfkuzco]

Um, I wanted to split this and the manager code in two seperate PRs to get your feedback on it quicker and to keep the changes smaller. Will update the manager code to use this while it's still under review.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.47619% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.44%. Comparing base (45a8704) to head (29111c8).

Files	Patch %	Lines
backend/src/mirrors_qa_backend/routes/worker.py	85.71%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   72.28%   73.44%   +1.15%     
==========================================
  Files          27       28       +1     
  Lines         747      787      +40     
  Branches       65       71       +6     
==========================================
+ Hits          540      578      +38     
  Misses        196      196              
- Partials       11       13       +2     

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