Use atleast 1 goroutine for async job

[sethiay]

Description

Use atleast 1 goroutine for async job in parallel downloads.

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.93%. Comparing base (32d784d) to head (acfa72d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2056      +/-   ##
==========================================
+ Coverage   71.76%   71.93%   +0.17%     
==========================================
  Files          99       99              
  Lines       10862    10887      +25     
==========================================
+ Hits         7795     7832      +37     
+ Misses       2734     2722      -12     
  Partials      333      333              

Flag	Coverage Δ
unittests	71.93% <100.00%> (+0.17%)	⬆️

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