[feat] legacy fixes & release tests for v1.17 & v1.18

[shaneutt]

What this PR does / why we need it:

• fixes broken compatibility with legacy Ingress from netv1beta1 & extv1beta1
• enables release testing against v1.17 and v1.18 clusters

Which issue this PR fixes

Supports #1095
Resolves #1614

Special notes for your reviewer:

These changes have been tested:

[codecov]

Codecov Report

Merging #1630 (b057d74) into next (d4a3376) will decrease coverage by 0.17%.
The diff coverage is 11.53%.

@@            Coverage Diff             @@
##             next    #1630      +/-   ##
==========================================
- Coverage   62.17%   61.99%   -0.18%     
==========================================
  Files          82       82              
  Lines        7172     7241      +69     
==========================================
+ Hits         4459     4489      +30     
- Misses       2384     2419      +35     
- Partials      329      333       +4     

Flag	Coverage Δ
integration-test	61.99% <11.53%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...trollers/configuration/zz_generated_controllers.go	33.95% <0.00%> (+1.35%)	⬆️
internal/ctrlutils/utils.go	88.46% <0.00%> (-5.29%)	⬇️
internal/store/store.go	65.72% <0.00%> (+0.01%)	⬆️
internal/ctrlutils/ingress-status.go	52.24% <13.63%> (-7.76%)	⬇️
internal/parser/parser.go	87.67% <0.00%> (-1.15%)	⬇️
...entset/typed/configuration/v1/kongclusterplugin.go	23.25% <0.00%> (+8.13%)	⬆️
pkg/clientset/typed/configuration/v1/kongplugin.go	24.21% <0.00%> (+8.42%)	⬆️

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