Upgrade various K8s dependencies

[ghost]

What type of PR is this?
cleanup

Which issue does this PR fix:
N/A - Proactive dependency maintenance

What does this PR do / Why do we need it:
This PR upgrades key Kubernetes dependencies to their latest versions and fixes API compatibility issues introduced by the upgrades. The changes include:

1. Dependency Upgrades:

   • sigs.k8s.io/controller-runtime: v0.20.2 → v0.22.1
   • k8s.io/api: v0.32.2 → v0.34.1
   • k8s.io/client-go: v0.32.2 → v0.34.1
   • github.com/stretchr/testify: v1.10.0 → v1.11.1
   • Go version: 1.23.6 → 1.24.0

2. API Compatibility Fixes:

   • Fixed apiutil.RESTClientForGVK function signature change (added missing boolean parameter)
   • Replaced deprecated res.Requeue with RequeueAfter pattern in controllers
   • Migrated from deprecated corev1.Endpoints to discoveryv1.EndpointSlice API
   • Updated test assertions to use RequeueAfter instead of deprecated Requeue field

These upgrades provide the latest bug fixes, security patches, and performance improvements from the Kubernetes ecosystem.

If an issue # is not available please add repro steps and logs from aws-gateway-controller showing the issue:
N/A - This is a proactive maintenance upgrade

Testing done on this change:

• make presubmit passes
• Updated unit tests to use new APIs (EndpointSlice instead of Endpoints)
• Verified controller logic maintains same behavior with new RequeueAfter pattern

Automation added to e2e:
No new e2e tests required - existing tests cover the same functionality with updated APIs

Will this PR introduce any new dependencies?:
No new external dependencies. Only upgraded existing Kubernetes client libraries to newer versions.

Will this break upgrades or downgrades. Has updating a running cluster been tested?:
No breaking changes for running clusters. The changes are internal API usage updates that maintain backward compatibility for deployed resources. The controller behavior remains functionally identical.

Does this PR introduce any user-facing change?:
No user-facing changes. All modifications are internal dependency upgrades and API compatibility fixes.

Updated Kubernetes dependencies to latest versions (controller-runtime v0.22.1, k8s.io/api v0.34.1, k8s.io/client-go v0.34.1) and fixed deprecated API usage for improved compatibility and security.