Fix page return error on project creation

In cases where you're not on the blank project creation form, if you
encounter a page error, you wouldn't be returned to the correct form and
would have to click back to it.

app/assets/javascripts/projects/experiment_new_project_creation/components/app.vue

@@ -12,6 +12,7 @@ import ciCdProjectIllustration from '../illustrations/ci-cd-project.svg';
 
 const BLANK_PANEL = 'blank_project';
 const CI_CD_PANEL = 'cicd_for_external_repo';
+const LAST_ACTIVE_TAB_KEY = 'new_project_last_active_tab';
 const PANELS = [
   {
     name: BLANK_PANEL,
@@ -105,7 +106,7 @@ export default {
     this.handleLocationHashChange();
 
     if (this.hasErrors) {
-      this.activeTab = BLANK_PANEL;
+      this.activeTab = localStorage.getItem(LAST_ACTIVE_TAB_KEY) || BLANK_PANEL;
     }
 
     window.addEventListener('hashchange', () => {
@@ -127,6 +128,9 @@ export default {
 
     handleLocationHashChange() {
       this.activeTab = window.location.hash.substring(1) || null;
+      if (this.activeTab) {
+        localStorage.setItem(LAST_ACTIVE_TAB_KEY, this.activeTab);
+      }
     },
   },