[Feature]: Add all retries as test runs to JUnit report

[MrGreenTea]

🚀 Feature Request

A config option for the junit reporter to add all retries to the output file.

Example

No response

Motivation

We're mostly using the junit reports together with flaky detection to monitor and detect flaky tests.

We currently have to use the retries config option which masks some of the flakiness, because the tests appear as success in the report.

I would love to be able to include the retries in our analysis for a more complete and precise flakiness detection.

[thomas-colgrove]

+1 would love this data to be included. seeing tests that are flaky can be a good indicator of test suite health

[ComaToastUK]

+1 This would be useful in helping us identify flaky tests

[alice-ep]

+1, our team would love this feature. Right now we're sampling test logs occasionally to try and catch flakiness, but it'd be much nicer to be able to follow this as a metric

[vazidmansuri005]

I've opened a PR implementing this feature: #39464

It adds an includeRetries option (and PLAYWRIGHT_JUNIT_INCLUDE_RETRIES env var) to the JUnit reporter. When enabled, each retry attempt is emitted as a separate <testcase> entry with a (retry #N) name suffix, so flaky test detection tools like flaky-tests-detection can see the full retry history.
@alice-ep @ComaToastUK @thomas-colgrove @MrGreenTea @mxschmitt
Default behavior is unchanged — the option is opt-in.