Remove unused OIDC test suite and time import

The oidc/serial-disruptive suite was defined but never used by any Prow job.
Analysis showed:
- No Prow job in openshift/release sets TEST_SUITE to this suite
- OIDC tests run via two paths:
  1. operator/serial suite (via e2e-aws-operator-serial-ote)
  2. Direct go test (via e2e-oidc job using make test-e2e-oidc)
- The suite definition was dead code

Also removed the now-unused time package import.

Co-Authored-By: Rohit Patil <ropatil@redhat.com>

Author: Rohit Patil

cmd/cluster-authentication-operator-tests-ext/main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"os"
-	"time"
 
 	"github.com/spf13/cobra"
 	"k8s.io/component-base/cli"
@@ -127,20 +126,6 @@ func prepareOperatorTestsRegistry() (*oteextension.Registry, error) {
 		},
 	})
 
-	// The following suite runs OIDC-specific disruptive tests.
-	// These tests must run serially as they modify cluster authentication configuration
-	// and may disrupt cluster operations.
-	defaultTimeout := 120 * time.Minute
-	extension.AddSuite(oteextension.Suite{
-		Name:             "openshift/cluster-authentication-operator/oidc/serial-disruptive",
-		Parallelism:      1,
-		ClusterStability: oteextension.ClusterStabilityDisruptive,
-		TestTimeout:      &defaultTimeout,
-		Qualifiers: []string{
-			`name.contains("[OIDC]") && name.contains("[Serial]") && name.contains("[Disruptive]")`,
-		},
-	})
-
 	specs, err := oteginkgo.BuildExtensionTestSpecsFromOpenShiftGinkgoSuite()
 	if err != nil {
 		return nil, fmt.Errorf("couldn't build extension test specs from ginkgo: %w", err)