Os release should always provide codename (bugfix)

[Hook25]

Description

This bugfix didn't take into consideration that ubuntu core doesn't have a codename. This patch provides backward compatibility by using the description (which is the pretty name of the os) as a codename (which is indeed proper for core).

Resolved issues

Fixes: CHECKBOX-1793

Documentation

Added a comment

Tests

Added a test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.84%. Comparing base (5baa4d0) to head (dcb22f8).
Report is 111 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1794   +/-   ##
=======================================
  Coverage   49.83%   49.84%           
=======================================
  Files         377      377           
  Lines       40719    40720    +1     
  Branches     6851     6850    -1     
=======================================
+ Hits        20294    20295    +1     
  Misses      19700    19700           
  Partials      725      725           

Flag	Coverage Δ
provider-resource	∅ <100.00%> (∅)

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[pieqq]

Looks good to me. Thanks!

[rickwu666666]

I've try this change with my UC24 system. And it worked for me. This PR is quite critical for the IoT QA who is test with Ubuntu Core. Since the current checkbox in beta and edge track will get the invalid submission that will block submission from upload to C3.
The invalid submission contact the distribution field as follow which is missing "codename"

 "distribution": {
        "description": "Ubuntu Core 24",
        "distributor_id": "Ubuntu Core",
        "release": "24"
    },

After sideload this chage, we can get something like this.

"distribution": {
        "codename": "Ubuntu Core 24",
        "description": "Ubuntu Core 24",
        "distributor_id": "Ubuntu Core",
        "release": "24"
    },