SNOW-976500 Do not drop errors from chunk downloader starting

[sfc-gh-pfus]

Description

Please explain the changes you made here.

Checklist

• Code compiles correctly
• Run make fmt to fix inconsistent formats
• Run make lint to get lint errors and fix all of them
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (e49463c) 82.83% compared to head (9c3b13b) 82.77%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
async.go	16.66%	5 Missing ⚠️
rows.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #994      +/-   ##
==========================================
- Coverage   82.83%   82.77%   -0.06%     
==========================================
  Files          50       50              
  Lines        9698     9708      +10     
==========================================
+ Hits         8033     8036       +3     
- Misses       1665     1672       +7     

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