This implementation is based on the [original
PR](https://github.com/microsoft/playwright/pull/19691) by @kevin940726.
It makes the reporter produce single file when there is no sharding and
multiple out-of-line report-x-of-y.zip reports which are automatically
merged together when put in one folder.
References https://github.com/microsoft/playwright/issues/10437
Co-authored-by: Kai Hao <kevin830726@gmail.com>
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