Remove silent abort from ajax calls

[HarelM]

Seems like this need to be solved sooner rather than later.
Fixes #3435.
Fixes #3308.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (47d7403) 75.58% compared to head (caf5956) 75.60%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/util/ajax.ts	50.00%	3 Missing ⚠️
src/source/image_source.ts	0.00%	1 Missing ⚠️
src/util/dispatcher.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3436      +/-   ##
==========================================
+ Coverage   75.58%   75.60%   +0.02%     
==========================================
  Files         243      243              
  Lines       19183    19163      -20     
  Branches     4247     4243       -4     
==========================================
- Hits        14499    14488      -11     
+ Misses       4684     4675       -9     

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[HarelM]

I was under the impression something will fail, guess the code is in a better shape than I thought...