[MergeDups] Toast when actions fail

[imnasnainaec]

Resolves #2099

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 74.35%. Comparing base (195323a) to head (47f8a1d).
Report is 32 commits behind head on master.

Files with missing lines	Patch %	Lines
...geDuplicates/MergeDupsStep/MergeDragDrop/index.tsx	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3607      +/-   ##
==========================================
- Coverage   74.40%   74.35%   -0.05%     
==========================================
  Files         285      285              
  Lines       11042    11049       +7     
  Branches     1348     1350       +2     
==========================================
  Hits         8216     8216              
- Misses       2438     2445       +7     
  Partials      388      388              

Flag	Coverage Δ
backend	83.72% <ø> (ø)
frontend	66.12% <0.00%> (-0.08%)	⬇️

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[andracc]

Reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)