Worker process start failure is reported as a test error and skips other
tests from the group.
If happened during stop (e.g. from a Ctrl+C) before worker has fully
initialized, this error is ignored.
Drive-by: send SIGINT in tests to the whole tree, to better emulate
Ctrl+C behavior.
A summary about the attempts we tried in
https://github.com/microsoft/playwright/pull/26931 for
https://github.com/microsoft/playwright/issues/26859 and
https://github.com/microsoft/playwright/issues/24591.
1. attempt: collect all the stdio from the worker host.
- this made it hard to capture the live console logs for the live trace
2. attempt: collect all the stdio from the worker host, but keep
proxying `process.{stdout,stderr}.write`.
- this solved the live console logs problem, since we could still listen
on them
- we found out about a race that the stdout/stderr streams can still
buffer data while the test already had finished
- we created a best effort flush implementation but didn't like the
complexity it introduced to the project
3. attempt: keep things like they are but also listen to stdio from the
worker host
- this solves the race of console.log in the test (things stay like they
are)
- this keeps live trace working (things stay like they are)
- a known pitfall is that it could result in logs which don't end up in
the reporter onStdOut/onStdErr, but it is already a significant
improvement over how it was before.
- before: they were not getting displayed
- after: they are getting displayed and there is a low likelihood that
they don't end up in the reporter API if the write happens slightly
before a test finished.
Closes#26931Fixes#26859Fixes#24591
