Refactor bt_list_adapters.py and add unit tests to it (BugFix)

[pieqq]

Description

Gave a presentation about unit testing in Checkbox. As a demo, picked a script with 0% coverage and improved its coverage.

While I initially wrote tests for the script, I realized it was a good candidate for a refactor, so I modified the script and wrote unit tests for my refactor.

Tests

• ./manage.py test -u pass
• I ran the script on my laptop and it prints out exactly the same data as before:

$ ./bt_list_adapters.py
rfkill3 dell-bluetooth

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8d1f256) 35.70% compared to head (cb0658c) 35.78%.
Report is 12 commits behind head on main.

Files	Patch %	Lines
providers/base/bin/bt_list_adapters.py	96.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #875      +/-   ##
==========================================
+ Coverage   35.70%   35.78%   +0.07%     
==========================================
  Files         303      303              
  Lines       34250    34262      +12     
  Branches     5917     5918       +1     
==========================================
+ Hits        12230    12260      +30     
+ Misses      21458    21439      -19     
- Partials      562      563       +1     

Flag	Coverage Δ
provider-base	5.50% <96.66%> (+0.20%)	⬆️

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[Hook25]

A few comments here and there, the only thing that is a no-go for me is hiding code from the coverage bot by putting it in under if __name__ == "__main__", please do take those lines into a main function

[Hook25]

Nice, well done ty!