fix(ui): Task summary should show fatal errors

[lupusA]

Hi,

currently, the task summary shows the total number of ignored errors. Since the user is interested in non ignored errors, the summary should show fatal errors (see https://kopia.discourse.group/t/kopiaui-bug-on-log/2171/2)

Fatal errors are already shown when browsing the snapshot (indicated by a warning sign). However, the task summary showed ignored errors causing inconsistencies between both views.

This PR contains the following fix:

• Store and send the total number of fatal errors

It would also be possible to extend the task summary to show ignored and fatal errors separately.

Feedback is welcomed.

Cheers,

[codecov]

Codecov Report

Patch coverage: 8.33% and project coverage change: +0.04% 🎉

Comparison is base (a620349) 75.41% compared to head (8760ebe) 75.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3190      +/-   ##
==========================================
+ Coverage   75.41%   75.46%   +0.04%     
==========================================
  Files         459      459              
  Lines       36445    36447       +2     
==========================================
+ Hits        27484    27503      +19     
+ Misses       7043     7033      -10     
+ Partials     1918     1911       -7     

Files Changed	Coverage Δ
snapshot/snapshotfs/upload_progress.go	70.10% <8.33%> (-1.48%)	⬇️

... and 8 files with indirect coverage changes

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[julio-lopez]

@jkowalski FYI