fix: codecov reporting for e2es

[gauron99]

add e2e reports back so it can be collected via codecov while taking the new FUNC_E2E* variable into consideration
(see comment below for more info)

[knative-prow]

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[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.52%. Comparing base (fc761ce) to head (c61155f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3239      +/-   ##
==========================================
+ Coverage   51.80%   54.52%   +2.71%     
==========================================
  Files         162      162              
  Lines       19132    19132              
==========================================
+ Hits         9912    10432     +520     
+ Misses       8242     7661     -581     
- Partials      978     1039      +61     

Flag	Coverage Δ
e2e	39.71% <ø> (?)
e2e go	35.69% <ø> (?)
e2e node	31.02% <ø> (?)
e2e python	35.34% <ø> (?)
e2e quarkus	31.18% <ø> (?)
e2e springboot	30.67% <ø> (?)
e2e typescript	31.14% <ø> (?)
integration	17.90% <ø> (+0.02%)	⬆️
unit macos-14	44.38% <ø> (ø)
unit macos-latest	44.38% <ø> (ø)
unit ubuntu-24.04-arm	44.57% <ø> (ø)
unit ubuntu-latest	45.32% <ø> (ø)
unit windows-latest	44.40% <ø> (ø)

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[gauron99]

This PR should fix recent codecov failures reporting about 7% drops (because less files are being reported) I noticed here for example: #3220
This issue has been introduced in the e2e refactor here #2938
The main CI has had some failures therefore the codecov can pick later main CI to compare to, its comparing to older coverages therefore these issues occur. I dont know why some PRs pick older ones while others dont. Weve had multiple (simple) PRs updating random stuff AFTER the e2e merge but this codecov failure has appeared only now

[matejvasek]

/lgtm