feat: skip setup gateway api related controllers when cluster not support

[ronething]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[github-actions]

conformance test report

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-30T02:31:40Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    result: partial
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 0
      Passed: 32
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests partially succeeded with 1 test skips.

[github-actions]

conformance test report - apisix mode

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-30T02:29:05Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    failedTests:
    - HTTPRouteInvalidBackendRefUnknownKind
    result: failure
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 1
      Passed: 31
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests failed with 1 test failures.

[github-actions]

conformance test report - apisix-standalone mode

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-30T02:27:58Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    failedTests:
    - HTTPRouteInvalidBackendRefUnknownKind
    result: failure
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 1
      Passed: 31
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests failed with 1 test failures.

[Copilot]

Pull Request Overview

This PR implements conditional controller registration based on cluster API resource availability, specifically skipping Gateway API controllers when the cluster doesn't support these resources.

• Adds utility functions to detect API resource availability in the cluster
• Refactors controller setup to conditionally register Gateway API controllers
• Comments out ADC_VERSION in CI workflows

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
pkg/utils/cluster.go	New utility functions for API resource detection using discovery client
internal/manager/controllers.go	Refactored controller setup with conditional registration logic
.github/workflows/apisix-e2e-test.yml	Comments out ADC_VERSION environment variable
.github/workflows/apisix-conformance-test.yml	Comments out ADC_VERSION environment variable

[AlinsRan]

The logic here is basically similar, we can write it like this:

	controllers := []Controller{}
	for resource, controller := range map[client.Object]Controller{
		&gatewayv1.GatewayClass{}: &controller.GatewayClassReconciler{
			Client:  mgr.GetClient(),
			Scheme:  mgr.GetScheme(),
			Updater: updater,
		},
		&gatewayv1.Gateway{}: &controller.GatewayReconciler{
			Client:  mgr.GetClient(),
			Scheme:  mgr.GetScheme(),
			Updater: updater,
		},
	} {
		if !utils.HasAPIResource(mgr, resource) {
			// log
		} else {
			controllers = append(controllers, controller)
		}
	}

[ronething]

updated.