cleanup

[frett]

• fix code style for the version catalog
• stop using deprecated buildDir
• Transition google-services plugin to modern mechanism of including it
• update google-services.json
• Update the app distribution plugin to be configured in the modern plugins block

[codecov]

Codecov Report

Merging #3106 (02efd7c) into develop (c233263) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3106      +/-   ##
===========================================
- Coverage    31.24%   31.23%   -0.01%     
===========================================
  Files          421      421              
  Lines        10299    10299              
  Branches      2288     2288              
===========================================
- Hits          3218     3217       -1     
  Misses        6543     6543              
- Partials       538      539       +1     

see 1 file with indirect coverage changes

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