(core) finish porting test/browser/*.test.js tests

Summary:
This finishes porting the bulk of tests relying on the old selenium pseudo-promise manager. Here the remaining ones that I know of:
 * There are some tests written in typescript at test/browser/*.test.ts (I've olny been looking at the older *.test.js ones so far)
 * There are some tests in test/home that run a slightly different way

First version of this diff just had renames, so for reviewing it is likely easiest to switch to a comparison of that version with the final version.

I switched from using test.(describe/it/...) to straight mocha since the indirection was confusing mocha-webdriver's debug functions (e.g. it was misnaming screenshots). That resulted in a lot of noise in the diff, sorry!

Some tests fail in headless operation in modern chrome for what looks to be the same reason as https://github.com/gristlabs/grist-core/pull/490 (some copy/paste nuance or change).

Test Plan: test porting

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3862

test/nbrowser/DocTutorial.ts

@@ -12,7 +12,7 @@ describe('DocTutorial', function () {
   let api: UserAPI;
   let session: gu.Session;
 
-  const cleanup = setupTestSuite();
+  const cleanup = setupTestSuite({team: true});
 
   before(async () => {
     session = await gu.session().teamSite.user('support').login();

test/nbrowser/gristUtils.ts

@@ -543,10 +543,11 @@ export async function rightClick(cell: WebElement) {
  * section. RowNum is a 1-based number as in the row headers, and col is a 0-based index for
  * grid view or field name for detail view.
  */
-export async function getCursorPosition(section?: WebElement) {
+export async function getCursorPosition(section?: WebElement|string) {
   return await retryOnStale(async () => {
+    if (typeof section === 'string') { section = await getSection(section); }
     section = section ?? await driver.findWait('.active_section', 4000);
-    const cursor = await section.findWait('.active_cursor', 1000);
+    const cursor = await section.findWait('.selected_cursor', 1000);
     // Query assuming the cursor is in a GridView and a DetailView, then use whichever query data
     // works out.
     const [colIndex, rowIndex, rowNum, colName] = await Promise.all([