Improve '--delete-obsolete' logic

[frombetelgeuse]

No description provided.

[codecov]

Codecov Report

Merging #394 (87962a4) into cli3 (19150b0) will decrease coverage by 0.05%.
The diff coverage is 54.55%.

@@             Coverage Diff              @@
##               cli3     #394      +/-   ##
============================================
- Coverage     58.00%   57.95%   -0.04%     
+ Complexity      926      924       -2     
============================================
  Files           146      146              
  Lines          4447     4454       +7     
  Branches        672      673       +1     
============================================
+ Hits           2579     2581       +2     
- Misses         1547     1553       +6     
+ Partials        321      320       -1     

Impacted Files	Coverage Δ
...wdin/cli/commands/actions/UploadSourcesAction.java	49.79% <0.00%> (-0.42%)	⬇️
...ubactions/DeleteObsoleteProjectFilesSubAction.java	65.12% <66.67%> (-3.30%)	⬇️

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