Cover all existing CEL rules in tests

[czeslavo]

Problem Statement

#25 added a test suite that allows verifying CRDs' CEL rules. The goal of this issue is to cover all existing rules that are not covered yet.

Proposed Solution

Add test cases for:

Tasks

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1. KonnectAPIAuthConfiguration
2. KonnectControlPlane
3. KongConsumer
4. KongPlugin
5. KongVault
6. KongRoute
7. KongService
8. KongClusterPlugin
9. KongIngress
10. KongUpstreamPolicy
11. KongCustomEntity
12. IngressClassParameters

Note: some of the test cases might be migrated from the existing suite in KIC.

Additional Information

Acceptance Criteria

• All existing CEL validations defined for CRDs in this repository are covered in tests against a real Kubernetes API server

[czeslavo]

Given all net new CRDs added for the Konnect entities feature are covered, I think it's no longer a blocker for the 1.4 release.