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