fix(#7015): Generate source maps for generating code coverage metrics

[ozyx]

Closes #7015

Describe your changes:

Turns out you need source maps to be generated if you want to generate coverage metrics. Who'dathunkit

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Author Checklist

• Changes address original issue?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.05%. Comparing base (5f0bd10) to head (31e6978).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7582      +/-   ##
==========================================
+ Coverage   55.34%   56.05%   +0.70%     
==========================================
  Files         672      672              
  Lines       27060    27094      +34     
  Branches     2626     2624       -2     
==========================================
+ Hits        14977    15188     +211     
- Misses      11360    11584     +224     
+ Partials      723      322     -401     

Flag	Coverage Δ
e2e-full	23.60% <ø> (ø)
e2e-stable	59.70% <ø> (-0.03%)	⬇️
unit	49.14% <ø> (+0.72%)	⬆️

see 242 files with indirect coverage changes

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