test: skip enterprise tests when image is enterprise but TEST_KONG_ENTERPRISE not enabled

[randmonkey]

What this PR does / why we need it:

Skip the test cases requiring enterprise features when TEST_KONG_ENTERPRISE is not set to true. This prevents the enterprise test cases to run if enterprise version of Kong image used, but TEST_KONG_ENTERPRISE is not set thus fails on the tests, because license is not initialized in such case.

Which issue this PR fixes:

fixes #5045
Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

- [x] the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR CHANGELOG not required

[team-k8s-bot]

Kong Gateway validation tests FAILED ❌ at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6875975436 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}

[team-k8s-bot]

Kong Gateway validation tests FAILED ❌ at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6875975838 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}

[team-k8s-bot]

Kong Gateway validation tests FAILED ❌ at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6875975485 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}

[team-k8s-bot]

Kong Gateway validation tests FAILED ❌ at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6875975638 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}

[team-k8s-bot]

Kong Gateway validation tests were started at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6876100637 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (21a05ab) 77.8% compared to head (df77f78) 78.0%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5165     +/-   ##
=======================================
+ Coverage   77.8%   78.0%   +0.1%     
=======================================
  Files        168     168             
  Lines      18896   18896             
=======================================
+ Hits       14712   14744     +32     
+ Misses      3354    3329     -25     
+ Partials     830     823      -7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[team-k8s-bot]

Kong Gateway validation tests PASSED ✅ at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6876100637 with the following parameters:

{
"e2e-controller-image-repo": "kong/kubernetes-ingress-controller",
"e2e-controller-image-tag": "latest",
"issue-number": "5165",
"kong-effective-version": "3.5.0",
"kong-image-repo": "kong/kong-gateway",
"kong-image-tag": "3.5.0.0"
}