* Some are no longer flaky or easily fixed
* Some are out of date or test things we can't do accurately (scroll
position) and are removed.
* Unwinds some uppy tests and makes sure all promises and runloops are
resolved.
Everything has been run in legacy/ember cli multiple times to ensure no
obvious suite regressions.
The leak was introduced in #11722 and a test was added that relied on it in #14563
This PR fixes the leak (bookmarks-test), fixes the test that relied on it (fast-edit-test), and repleces some ad-hoc code with cloneJSON helper (other files)
