♻️ Refactors from locator find query branch

[jrolfs]

Refactors extracted from #488 to clean up the diff:

• Isolate 'standard' page (no timeout) in describe block so that both standard and deferred page tests have beforeEach and afterEach to open and close the page
• Rename SupportedQueries to SynchronousQueries in preparation to support find* queries
• Use queries from Testing Library to enumerate queries (instead of internal hard-coded query name array, with the intention of removing all of the legacy ElementHandle implementation in a future major release)