add subcommand for updating mirror detail

[elfkuzco]

Changes

• add subcommand for updating a mirror's details
  • update the list of other countries for a mirror using --regions. This sets the other_countries using all the countries found in the provided regions in addition to the countries in the default region of the mirror.
  • update the default region for a mirror using --region
  • update the default country of a mirror using --country

These changes (in additon to #42 ) lay the foundation for #39 as the initial db schema didn't have regions or country information in mirrors

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 28.76712% with 52 lines in your changes missing coverage. Please review.

Project coverage is 69.66%. Comparing base (656e88d) to head (ae7183c).

Files	Patch %	Lines
backend/src/mirrors_qa_backend/entrypoint.py	0.00%	33 Missing ⚠️
backend/src/mirrors_qa_backend/cli/mirrors.py	0.00%	13 Missing ⚠️
backend/src/mirrors_qa_backend/db/mirrors.py	77.77%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   72.75%   69.66%   -3.10%     
==========================================
  Files          30       30              
  Lines         881      946      +65     
  Branches       81       93      +12     
==========================================
+ Hits          641      659      +18     
- Misses        222      267      +45     
- Partials       18       20       +2     

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[rgaudin]

LGTM