Improve developer ergonomics of DebugToolbarLiveTestCase
Improve developer ergonomics of DebugToolbarLiveTestCase

Add method "get()". This removes the need for new tests to repetitively
call:

    self.selenium.get(self.live_server_url + "...")

Now:

    self.get("...")

Add new property "wait". This removes the need for new tests to
repetitively call:

    WebDriverWait(self.selenium, timeout=10).until(...

Now:

    self.wait.until(...

The timeout value has also been reduced as 10s is too long. In a local
test environment, these tests should pass very quickly. In the event
that something goes wrong, provide feedback to the developer quicker
rather than waiting a full 10s.

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