Merge branch '451128-vue3-migration-import_projects-mutations' into 'master'

Remove Vue delete from import_projects/store/mutations

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147573



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Ross Byrne <robyrne@gitlab.com>
Approved-by: Alexander Turinske <aturinske@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>

app/assets/javascripts/import_entities/import_projects/store/mutations.js

@@ -129,7 +129,9 @@ export default {
       importTarget.targetNamespace === state.defaultTargetNamespace &&
       importTarget.newName === existingRepo.importSource.sanitizedName
     ) {
-      Vue.delete(state.customImportTargets, repoId);
+      const importsCopy = { ...state.customImportTargets };
+      delete importsCopy[repoId];
+      state.customImportTargets = importsCopy;
     } else {
       Vue.set(state.customImportTargets, repoId, importTarget);
     }