[ci:component:github.com/gardener/machine-controller-manager:v0.49.0->v0.50.1]

[gardener-robot-ci-2]

Release Notes:

An issue causing nil pointer panic on scaleup of the machinedeployment along with trigger of rolling update, is fixed

New metrics introduced: 
- api_request_duration_seconds -> tracks time taken for successful invocation of provider APIs. This metric can be filtered by provider and service.
- driver_request_duration_seconds -> tracks total time taken to successfully complete driver method invocation. This metric can be filtered by provider and operation.
- driver_requests_failed_total -> records total number of failed driver API requests. This metric can be filtered by provider, operations and error_code.

An edge case where outdated DesiredReplicas annotation blocked a rolling update is fixed.

Force drain and delete volume attachments for nodes un-healthy due to `ReadOnlyFileSystem` and `NotReady` for too long

status.Status now captures underline cause, allowing consumers to introspect the error returned by the provider. WrapError() function could be used to wrap the provider error

Makefile targets have changed: Introduced gardener-setup, gardener-restore, gardener-local-mcm-up, non-gardener-setup, non-gardener-restore,  non-gardener-local-mcm-up. Users can also directly use the scripts which are used by these makefile targets.

Added `errorCode` field in the `LastOperation` struct. This should be implemented only for the `CreateMachine` call in the `triggerCreationFlow`. This field will be utilized by Cluster autoscaler to do early backoff 

Removed dead metrics code and refactored the remaining metrics code

Bump `k8s.io/*` deps to v0.27.2

Included `UnavailableReplicas` in determining if a machine deployment status update is needed

Added a new metric that will allow to get the number of stale (due to unhealthiness) machines  that are getting terminated

Updated to go v1.20.5

A new make target is introduced to add license headers.

[gardener-robot]

@gardener-robot-ci-2 Thank you for your contribution.