CNV-21086: Change Not migratable label style

Change the label to Compact, Unfilled, Orange,
according to the design changes and Patternfly styles.

Fixes https://issues.redhat.com/browse/CNV-21086

src/views/virtualmachines/list/components/VMNotMigratableLabel/VMNotMigratableLabel.tsx

@@ -17,7 +17,9 @@ const VMNotMigratableLabel: React.FC<VMNotMigratableLabelProps> = ({ vm }) => {
 
   return !isMigratable ? (
     <SplitItem>
-      <Label key="available-boot">{t('Not migratable')}</Label>
+      <Label isCompact variant="outline" color="orange" key="available-boot">
+        {t('Not migratable')}
+      </Label>
     </SplitItem>
   ) : null;
 };