fix: allow to deploy Kong Gateway EE in DBLess mode

[programmer04]

This PR fixes KTF to allow deployment of Kong Gateway EE in DBLess mode. New introduced test TestKongEnterpriseDBLess checks it. The adjustment has to be made for tests for the enterprise version. Instead of using /workspaces that silently doesn't work in DBLess mode when trying to configure them - nothing is created (will be reported to the upstream, but it's rather considered as normal, old, expected behavior) /consumer_groups are used. Consumer Groups work in the same way in both versions.

[codecov-commenter]

Codecov Report

Patch coverage: 85.00% and project coverage change: -2.10% ⚠️

Comparison is base (ae6ce7b) 59.40% compared to head (8bfed1f) 57.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #757      +/-   ##
==========================================
- Coverage   59.40%   57.30%   -2.10%     
==========================================
  Files          44       44              
  Lines        3569     3567       -2     
==========================================
- Hits         2120     2044      -76     
- Misses       1170     1259      +89     
+ Partials      279      264      -15     

Flag	Coverage Δ
integration-test	57.30% <85.00%> (-2.10%)	⬇️

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Files Changed	Coverage Δ
pkg/clusters/addons/kong/addon.go	59.95% <85.00%> (-0.19%)	⬇️

... and 2 files with indirect coverage changes

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[pmalek]

TestKongEnterprisePostgres fails :(

[programmer04]

flake 🥲

 Error: UPGRADE FAILED: failed to create resource: Service "ingress-controller-kong-proxy" is invalid: spec.ports[0].nodePort: Invalid value: 30080: provided port is already allocated

@pmalek

reported in #677