[operator] Introduce gardensystem/virtual Golang component (gardene…

…r#8276)

* Move `gardensystem` component to `gardensystem/runtime`

* Add `gardensystem/virtual` component boilerplate

* Translate seed bootstrapper RBAC resources

Ref:
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrole-seed-bootstrapper.yaml
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrolebinding-seed-bootstrapper.yaml

* Translate `gardenlet` RBAC resources

Ref:
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrole-seeds.yaml
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrolebinding-seeds.yaml

* Translate garden `Namespace`

Ref:
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/namespace-garden.yaml

* Translate admin RBAC roles

Ref:
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/rbac-user.yaml#L3-L73
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/clusterrolebinding-kube-aggregator-admin.yaml

* Translate remaining RBAC resources

Ref:
- https://github.com/gardener/gardener/blob/master/charts/gardener/controlplane/charts/application/templates/rbac-user.yaml#L75-L571

pkg/component/gardensystem/gardensystem.go → pkg/component/gardensystem/runtime/runtime.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package gardensystem
+package runtime
 
 import (
 	"context"
@@ -31,7 +31,7 @@ import (
 // ManagedResourceName is the name of the ManagedResource containing the resource specifications.
 const ManagedResourceName = "garden-system"
 
-// New creates a new instance of DeployWaiter for garden system resources.
+// New creates a new instance of DeployWaiter for runtime garden system resources.
 func New(client client.Client, namespace string) component.DeployWaiter {
 	return &gardenSystem{
 		client:    client,

pkg/component/gardensystem/gardensystem_suite_test.go → pkg/component/gardensystem/runtime/runtime_suite_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package gardensystem_test
+package runtime_test
 
 import (
 	"testing"
@@ -21,7 +21,7 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-func TestGardenSystem(t *testing.T) {
+func TestRuntime(t *testing.T) {
 	RegisterFailHandler(Fail)
-	RunSpecs(t, "Component GardenSystem Suite")
+	RunSpecs(t, "Component GardenSystem Runtime Suite")
 }

pkg/component/gardensystem/gardensystem_test.go → pkg/component/gardensystem/runtime/runtime_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package gardensystem_test
+package runtime_test
 
 import (
 	"context"
@@ -30,7 +30,7 @@ import (
 	gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
 	resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
 	"github.com/gardener/gardener/pkg/component"
-	. "github.com/gardener/gardener/pkg/component/gardensystem"
+	. "github.com/gardener/gardener/pkg/component/gardensystem/runtime"
 	operatorclient "github.com/gardener/gardener/pkg/operator/client"
 	"github.com/gardener/gardener/pkg/resourcemanager/controller/garbagecollector/references"
 	"github.com/gardener/gardener/pkg/utils/retry"
@@ -39,7 +39,7 @@ import (
 	. "github.com/gardener/gardener/pkg/utils/test/matchers"
 )
 
-var _ = Describe("GardenSystem", func() {
+var _ = Describe("Runtime", func() {
 	var (
 		ctx = context.TODO()