Make Wait for Download false for all read scenarios when parallel downloads is true

[ankitaluthra1]

Description

Make Wait for Download false for all read scenarios when parallel downloads is true

Link to the issue in case of a bug fix.

b/345645002

Testing details

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.54%. Comparing base (1e42721) to head (18d7e6e).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2027      +/-   ##
==========================================
+ Coverage   71.37%   71.54%   +0.17%     
==========================================
  Files          97       98       +1     
  Lines       10709    10759      +50     
==========================================
+ Hits         7644     7698      +54     
+ Misses       2722     2718       -4     
  Partials      343      343              

Flag	Coverage Δ
unittests	71.54% <100.00%> (+0.17%)	⬆️

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