chunk: limit number of upload goroutines

[SandyXSD]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1625 (3696c91) into main (5fc885c) will decrease coverage by 0.11%.
The diff coverage is 63.98%.

@@            Coverage Diff             @@
##             main    #1625      +/-   ##
==========================================
- Coverage   61.49%   61.37%   -0.12%     
==========================================
  Files         133      133              
  Lines       22475    22562      +87     
==========================================
+ Hits        13820    13848      +28     
- Misses       7088     7151      +63     
+ Partials     1567     1563       -4     

Impacted Files	Coverage Δ
pkg/meta/config.go	54.66% <ø> (ø)
pkg/object/interface.go	80.00% <0.00%> (-20.00%)	⬇️
pkg/object/prefix.go	69.76% <0.00%> (-7.16%)	⬇️
pkg/meta/base.go	71.91% <25.00%> (-0.33%)	⬇️
pkg/chunk/disk_cache.go	80.19% <33.33%> (-0.60%)	⬇️
pkg/object/sharding.go	69.52% <33.33%> (-1.35%)	⬇️
pkg/meta/utils.go	71.67% <44.44%> (-1.50%)	⬇️
pkg/meta/redis.go	73.01% <50.00%> (+0.18%)	⬆️
pkg/sync/sync.go	39.73% <52.63%> (+2.28%)	⬆️
cmd/sync.go	66.80% <62.50%> (-0.15%)	⬇️
... and 22 more

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