Refactor Etcdcopybackupstask to eliminate Helm chart (#553)

* Refactor the EtcdCopyBackupsTask controller to formulate/create an EtcdCopyBackupsTaskjob using Golang instead of a Helm chart.

* removed helm chart

* Add test case for handling ownerReferences with numeric names and leading 0

* Rename `08foo` to `01234`

* Apply suggestions from code review

Co-authored-by: Shreyas Rao <42259948+shreyas-s-rao@users.noreply.github.com>

* Addressed review comments
- Added function `GetCopyBackupsJobName` which returns the name of the CopyBackups Job.
- Used common constants `GardenerOwnedBy`, `GardenerOwnerType`, `LabelNetworkPolicyToDNS`, `LabelNetworkPolicyToPublicNetworks` instead of static string.
- Added function `GetBackupRestoreImage` which returns the image for `backup-restore` from the given image vector.

* Fix intergration test

* Update api/v1alpha1/types_etcdcopybackupstask.go

Co-authored-by: Madhav Bhargava <madhav.bhargava@sap.com>

* revert changes related to Used common constants ,

* Addressed review comments:
- Renamed functions:
    - `GetCopyBackupsJobName` to `GetJobName`
    - `getVolumes` to `createVolumesFromstore`
    - `getVolumeMounts` to `createVolumeMountsFromStore`
    - `getEnvVarFromValues` to `mapToEnvVar`
    - `getProviderEnvs` to `createEnvVarsFromStore`
    - `setEtcdBackupJobCommands` to `createJobCommandFromStore`
- Refactored code to formulate the job while addressing review comments.

* changed the way Job command is created, removed some methods from image.gog

* Add unit tests

* Apply suggestions from code review

Co-authored-by: Madhav Bhargava <madhav.bhargava@sap.com>

* Addressed review feeback

* Removed duplicate test case

---------

Co-authored-by: Shreyas Rao <42259948+shreyas-s-rao@users.noreply.github.com>
Co-authored-by: Madhav Bhargava <madhav.bhargava@sap.com>

api/v1alpha1/types_etcdcopybackupstask.go

@@ -14,7 +14,11 @@
 
 package v1alpha1
 
-import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+import (
+	"fmt"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
 
 // +genclient
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -93,3 +97,8 @@ type EtcdCopyBackupsTaskStatus struct {
 	// +optional
 	LastError *string `json:"lastError,omitempty"`
 }
+
+// GetJobName returns the name of the CopyBackups Job.
+func (e *EtcdCopyBackupsTask) GetJobName() string {
+	return fmt.Sprintf("%s-worker", e.Name)
+}