[stable10] Retry chunks in web UI on stalled uploads

[PVince81]

Backport of #30776 to stable10

[phil-davis]

It got some silly timeout in the Travis litmus-v1 job. I restarted that.

[codecov]

Codecov Report

Merging #31005 into stable10 will decrease coverage by <.01%.
The diff coverage is 0%.

@@              Coverage Diff               @@
##             stable10   #31005      +/-   ##
==============================================
- Coverage       59.87%   59.87%   -0.01%     
  Complexity      18099    18099              
==============================================
  Files            1189     1189              
  Lines           71403    71407       +4     
  Branches         1248     1248              
==============================================
+ Hits            42753    42755       +2     
- Misses          28280    28282       +2     
  Partials          370      370

Flag	Coverage Δ	Complexity Δ
#javascript	52.62% <ø> (+0.02%)	0 <ø> (ø)	⬇️
#phpunit	60.67% <0%> (-0.01%)	18099 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
apps/files/lib/App.php	25% <0%> (-12.5%)	3 <0> (ø)
core/js/js.js	54.84% <0%> (+0.23%)	0% <0%> (ø)	⬇️

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