chore: remove knative support

[pmalek]

What this PR does / why we need it:

Removes knative support.

Which issue this PR fixes:

Related #2813

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (9c19f60) 67.8% compared to head (00160b8) 67.6%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4748     +/-   ##
=======================================
- Coverage   67.8%   67.6%   -0.2%     
=======================================
  Files        165     163      -2     
  Lines      19066   18667    -399     
=======================================
- Hits       12927   12621    -306     
+ Misses      5380    5311     -69     
+ Partials     759     735     -24     

Files	Coverage Δ
internal/annotations/annotations.go	98.7% <ø> (ø)
internal/controllers/utils/utils.go	95.6% <ø> (-2.7%)	⬇️
internal/dataplane/parser/parser.go	81.7% <ø> (-3.1%)	⬇️
internal/dataplane/parser/translate_utils.go	94.1% <ø> (+4.8%)	⬆️
internal/manager/config.go	95.0% <ø> (-0.1%)	⬇️
internal/manager/controllerdef.go	99.4% <ø> (-0.1%)	⬇️
internal/manager/featuregates/feature_gates.go	100.0% <ø> (ø)
internal/manager/scheme/scheme.go	22.2% <ø> (-0.4%)	⬇️
internal/store/fake_store.go	38.6% <ø> (-0.6%)	⬇️
internal/store/store.go	62.5% <ø> (+0.3%)	⬆️
... and 1 more

... and 8 files with indirect coverage changes

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[programmer04]

🧹
Also, Helm chart has to be adjusted to not install Knative-related stuff for KIC >=3.0

[programmer04]

🕺 removing code is the best thing