Preserve nodePort support with --preserve-nodeports flag (#3095)

* -> Preserve nodePort support when restoring via "--preserve-nodeports" flag

Signed-off-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

* -> Added changelog.

Signed-off-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

* -> Unit test added.
-> Using boolptr.IsSetToTrue for bool ptr check.

Signed-off-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

* -> Unit test added.
-> Using boolptr.IsSetToTrue for bool ptr check.

Signed-off-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

* -> Other restore errors log level changed from info to error.
-> Documentation updated about Velero nodePort restore logic and preservation of them.

Signed-off-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

Co-authored-by: Yusuf Güngör <yusuf.gungor@hepsiburada.com>

design/CLI/PoC/base/CRDs.yaml

@@ -679,6 +679,10 @@ spec:
                 PVs from snapshot (via the cloudprovider).
               nullable: true
               type: boolean
+            preserveNodePorts:
+              description: PreserveNodePorts specifies whether to restore old nodePorts from backup.
+              nullable: true
+              type: boolean
             scheduleName:
               description: ScheduleName is the unique name of the Velero schedule
                 to restore from. If specified, and BackupName is empty, Velero will