chore: add withStream method to MockedAppRootBuilder

[dionisio-bot]

Backport of #36875

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Latest commit: 6ba7133

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.11%. Comparing base (c8e778a) to head (6ba7133).
⚠️ Report is 1 commits behind head on release-7.10.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.10.1   #37027   +/-   ##
===============================================
  Coverage           66.11%   66.11%           
===============================================
  Files                3287     3287           
  Lines              110198   110198           
  Branches            20890    20892    +2     
===============================================
+ Hits                72856    72860    +4     
+ Misses              34661    34657    -4     
  Partials             2681     2681           

Flag	Coverage Δ
e2e	57.40% <ø> (+0.01%)	⬆️
unit	71.42% <ø> (+<0.01%)	⬆️

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