Auto-balancing Playwright Shards

Hey folks,

I used to work on Playwright, and I noticed that Vinext uses Playwright too, including sharding in CI.

These days I’m building [Flakiness.io](https://flakiness.io/): a GitHub-native test analytics dashboard that tracks flaky tests and detects regressions in pull requests.

We’re prototyping [Playwright shard balancing](https://github.com/flakiness/playwright/issues/28), where Flakiness.io uses historical test timings to produce better-balanced shards. Since Vinext has a real-world Playwright setup, I’d be very happy if you’re open to testing it on your workload.

OSS projects can use Flakiness.io for free. I’d be happy to help set it up and see if you find it useful.

Cheers,
Andrey