(core) Polishing upgrade plan UI

Summary:
- Update nudge boxes content and collapsing on personal and free team site
- New confirmation after upgrading from a free team site
- Refactoring ProductUpgrade code, splitting plans / modals and nudges

Test Plan: Manual and updated tests

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3481

test/nbrowser/testUtils.ts

@@ -82,7 +82,9 @@ export function setupTestSuite(options?: TestSuiteOptions) {
   checkForExtraWindows();
 
   // After every suite, clear sessionStorage and localStorage to avoid affecting other tests.
-  after(clearCurrentWindowStorage);
+  if (!process.env.NO_CLEANUP) {
+    after(clearCurrentWindowStorage);
+  }
   // Also, log out, to avoid logins interacting, unless NO_CLEANUP is requested (useful for
   // debugging tests).
   if (!process.env.NO_CLEANUP) {