Previously, we would use any error that was added during the step
execution as an error for this particular step.
This produces false positives, for example failing `page.click` call
that happened during `context` teardown was producing an error and
marking teardown is failed. However, in reality, the test itself has
failed, while teardown has not.
New approach uses test step hierarchy to inherit errors from child steps
to the parent step. This does not regress the original fix where
`expect.soft` errors are surfaced in the parent step.
See also #19973 that introduced the original logic.
There was a single test fixture scope that covers all hooks, modifiers
and test function. Now beforeAll-like modifiers, beforeAll and afterAll
hooks get a scope each.
Fixes#22256.
