[WIP] update integration tests

[maksymvavilov]

Since we are no longer generating endpoints here in this PR I am:

1. Removing validation of the endpoints (checking only for their presence)
2. Merging two test files reducing total amount of tests run against the dnspolicy controller

It is a follow up on the #799

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.01%. Comparing base (ece13e8) to head (e451f1b).
Report is 193 commits behind head on main.

Files with missing lines	Patch %	Lines
controllers/dnspolicy_dnsrecords.go	84.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #882      +/-   ##
==========================================
+ Coverage   80.20%   81.01%   +0.80%     
==========================================
  Files          64       89      +25     
  Lines        4492     6879    +2387     
==========================================
+ Hits         3603     5573    +1970     
- Misses        600      888     +288     
- Partials      289      418     +129     

Flag	Coverage Δ
bare-k8s-integration	6.84% <0.00%> (?)
controllers-integration	73.01% <88.23%> (?)
envoygateway-integration	49.49% <0.00%> (?)
gatewayapi-integration	12.59% <0.00%> (?)
integration	?
istio-integration	53.39% <0.00%> (?)
unit	28.46% <0.00%> (-1.57%)	⬇️

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

Components	Coverage Δ
api/v1beta1 (u)	84.61% <100.00%> (+13.18%)	⬆️
api/v1beta2 (u)	81.25% <75.17%> (-10.18%)	⬇️
pkg/common (u)	79.66% <ø> (-9.17%)	⬇️
pkg/istio (u)	70.95% <ø> (-2.96%)	⬇️
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	∅ <ø> (∅)
pkg/rlptools (u)	84.26% <ø> (+4.81%)	⬆️
controllers (i)	82.46% <80.83%> (+5.66%)	⬆️

Files with missing lines	Coverage Δ
controllers/dns_helper.go	92.30% <100.00%> (+8.32%)	⬆️
controllers/dnspolicy_dnsrecords.go	64.22% <84.00%> (-1.47%)	⬇️

... and 39 files with indirect coverage changes