Move provider-packet controller to dedicated repository

```noteworthy developer
The `provider-packet` extension controller has been moved to https://github.com/gardener/gardener-extension-shoot-cert-service (based on e879ddb).
```

Dockerfile

@@ -31,7 +31,6 @@ COPY controllers/provider-azure/charts /controllers/provider-azure/charts
 COPY controllers/provider-gcp/charts /controllers/provider-gcp/charts
 COPY controllers/provider-openstack/charts /controllers/provider-openstack/charts
 COPY controllers/provider-alicloud/charts /controllers/provider-alicloud/charts
-COPY controllers/provider-packet/charts /controllers/provider-packet/charts
 COPY controllers/provider-vsphere/charts /controllers/provider-vsphere/charts
 
 COPY --from=builder /go/bin/gardener-extension-hyper /gardener-extension-hyper

Makefile

@@ -158,20 +158,6 @@ start-provider-alicloud:
 		--webhook-config-mode=$(WEBHOOK_CONFIG_MODE) \
 		$(WEBHOOK_PARAM)
 
-.PHONY: start-provider-packet
-start-provider-packet:
-	@LEADER_ELECTION_NAMESPACE=garden GO111MODULE=on go run \
-		-mod=vendor \
-		-ldflags $(LD_FLAGS) \
-		./controllers/provider-packet/cmd/gardener-extension-provider-packet \
-		--config-file=./controllers/provider-packet/example/00-componentconfig.yaml \
-		--ignore-operation-annotation=$(IGNORE_OPERATION_ANNOTATION) \
-		--leader-election=$(LEADER_ELECTION) \
-		--webhook-config-server-host=0.0.0.0 \
-		--webhook-config-server-port=8443 \
-		--webhook-config-mode=$(WEBHOOK_CONFIG_MODE) \
-		$(WEBHOOK_PARAM)
-
 .PHONY: start-provider-vsphere
 start-provider-vsphere:
 	@LEADER_ELECTION_NAMESPACE=garden GO111MODULE=on go run \

controllers/hyper/cmd/gardener-extension-hyper/app/app.go

@@ -9,7 +9,6 @@ import (
 	providerazure "github.com/gardener/gardener-extensions/controllers/provider-azure/cmd/gardener-extension-provider-azure/app"
 	providergcp "github.com/gardener/gardener-extensions/controllers/provider-gcp/cmd/gardener-extension-provider-gcp/app"
 	provideropenstack "github.com/gardener/gardener-extensions/controllers/provider-openstack/cmd/gardener-extension-provider-openstack/app"
-	providerpacket "github.com/gardener/gardener-extensions/controllers/provider-packet/cmd/gardener-extension-provider-packet/app"
 	providervsphere "github.com/gardener/gardener-extensions/controllers/provider-vsphere/cmd/gardener-extension-provider-vsphere/app"
 
 	"github.com/spf13/cobra"
@@ -27,7 +26,6 @@ func NewHyperCommand(ctx context.Context) *cobra.Command {
 		providergcp.NewControllerManagerCommand(ctx),
 		provideropenstack.NewControllerManagerCommand(ctx),
 		provideralicloud.NewControllerManagerCommand(ctx),
-		providerpacket.NewControllerManagerCommand(ctx),
 		providervsphere.NewControllerManagerCommand(ctx),
 		validatoraws.NewValidatorCommand(ctx),
 	)