Remove old async utils from the entire plugin #681
Description
Relates to #627
Since wait, waitForElement and waitForDomChange have been removed from latest Testing Library versions, we need to do a general clean-up to remove checks for them in the plugin.
For example, the prefer-find-by rule is still looking for wait and waitForElement usages. They must be removed, which would simplify the rule, and tests.
The same could apply to other rules, and also documentation.