rebase: Bump sigs.k8s.io/controller-runtime

Bumps [sigs.k8s.io/controller-runtime](https://github.com/kubernetes-sigs/controller-runtime) from 0.15.1-0.20230524200249-30eae58f1b98 to 0.15.1.
- [Release notes](https://github.com/kubernetes-sigs/controller-runtime/releases)
- [Changelog](https://github.com/kubernetes-sigs/controller-runtime/blob/main/RELEASE.md)
- [Commits](https://github.com/kubernetes-sigs/controller-runtime/commits/v0.15.1)

---
updated-dependencies:
- dependency-name: sigs.k8s.io/controller-runtime
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/sigs.k8s.io/controller-runtime/pkg/manager/manager.go

@@ -19,6 +19,7 @@ package manager
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"net"
 	"net/http"
@@ -391,6 +392,9 @@ type LeaderElectionRunnable interface {
 
 // New returns a new Manager for creating Controllers.
 func New(config *rest.Config, options Options) (Manager, error) {
+	if config == nil {
+		return nil, errors.New("must specify Config")
+	}
 	// Set default values for options fields
 	options = setOptionsDefaults(options)
 
@@ -412,6 +416,11 @@ func New(config *rest.Config, options Options) (Manager, error) {
 		return nil, err
 	}
 
+	config = rest.CopyConfig(config)
+	if config.UserAgent == "" {
+		config.UserAgent = rest.DefaultKubernetesUserAgent()
+	}
+
 	// Create the recorder provider to inject event recorders for the components.
 	// TODO(directxman12): the log for the event provider should have a context (name, tags, etc) specific
 	// to the particular controller that it's being injected into, rather than a generic one like is here.