Testing improvements

[T4rk1n]

• Disable the pytest plugin if dash[testing] not installed, fix pytest plugin should not be registered by default #946
• Do not swallow the original error to get the webdriver, easier to know what is wrong after updating the browser but the driver.
• Add wait_timeout property to customize the behavior of the default wait timeout used for by wait_for_page, fix [Feature Request] dash.testing.browser should allow custom timeout on wait_for_page() #1595
• Add the element target text for wait_for_text* error message. Resolve [Feature Request] Better failure messages from _wait_for test methods #945

[alexcjohnson]

Oh man, I've been thinking we should have useful error messages like this for a long time, thanks!

[alexcjohnson]

💃

[RonnyPfannschmidt]

this breaks as hookwrapeprs are expectedto yield, and rightfuly so
see pytest-dev/pytest#10820

[RonnyPfannschmidt]

ah, already fixed via #2461 and reported in #2460

lovely 👍