V2Wizard: Make useHas<target>TargetOnly hook re-usable

This refines `useHasIsoTargetOnly` hook into `useHasSpecificTargetOnly` hook which takes an image type as an argument and can be re-used for non-iso targets as well.

src/Components/CreateImageWizardV2/utilities/hasSpecificTargetOnly.ts

@@ -0,0 +1,8 @@
+import { useAppSelector } from '../../../store/hooks';
+import { ImageTypes } from '../../../store/imageBuilderApi';
+import { selectImageTypes } from '../../../store/wizardSlice';
+
+export const useHasSpecificTargetOnly = (target: ImageTypes) => {
+  const environments = useAppSelector(selectImageTypes);
+  return environments.length === 1 && environments.includes(target);
+};