fix(remove-datamover): remove ValidateDataMover and snapshot polling logic

Remove the plugin-side snapshot/datamover polling since Velero already
handles VolumeSnapshotContent, VolumeSnapshot, DataUpload, and
PodVolumeBackup lifecycle natively. This eliminates duplicated work
and simplifies the plugin significantly.

Removed:
- ValidateDataMover, reconcileStandardDataMover, reconcileAzureDataMover
- All Check/Wait/Reconcile functions for snapshots and data uploads
- BlackList struct and all associated functions
- PodVolumeBackup polling logic
- DataUploadTimeout/DataUploadCheckPace configuration options
- All associated tests (~5000 lines removed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Juan Manuel Parrilla Madrid <jparrill@redhat.com>

Author: jparrill

pkg/common/types.go

@@ -1,7 +1,5 @@
 package common
 
-import "time"
-
 const (
 	CommonBackupAnnotationName  string = "hypershift.openshift.io/common-backup-plugin"
 	CommonRestoreAnnotationName string = "hypershift.openshift.io/common-restore-plugin"
@@ -13,10 +11,6 @@ const (
 
 	PluginConfigMapName string = "hypershift-oadp-plugin-config"
 
-	// Default values for the backup plugin.
-	defaultPVBackupTimeout   time.Duration = 30 * time.Minute
-	defaultPVBackupCheckPace time.Duration = 10 * time.Second
-
 	DefaultK8sSAFilePath string = "/var/run/secrets/kubernetes.io/serviceaccount"
 	KubevirtRHCOSLabel   string = "hypershift.openshift.io/is-kubevirt-rhcos"