Cleanup: Codecov update, unify flags and ignore unwanted files

[gauron99]

Changes

• 🧹 Removes unnecessary flags/coverages (runtimes tests)
• 🧹 remove unnecessary workaround file
• 🧹 ignore dirs that dont contain code we want to cover (.codecov.yaml changes)
• Unify the flags so that we have only 3 clear ones -- unit integration e2e

/kind cleanup

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.44%. Comparing base (688a39e) to head (c949c86).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2773      +/-   ##
==========================================
+ Coverage   61.59%   63.44%   +1.84%     
==========================================
  Files         131      127       -4     
  Lines       15796    15533     -263     
==========================================
+ Hits         9730     9855     +125     
+ Misses       5155     4738     -417     
- Partials      911      940      +29     

Flag	Coverage Δ
e2e-test	?
e2e-test-oncluster	?
e2e-tests	43.59% <ø> (?)
integration-tests	49.45% <ø> (+2.64%)	⬆️
unit-tests	49.49% <ø> (?)
unit-tests-macos-latest	?
unit-tests-ubuntu-latest	?
unit-tests-windows-latest	?

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[gauron99]

@matejvasek @lkingland PTAL

[matejvasek]

/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, matejvasek

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