Improve Image Diff viewer in result report about galata

[fcollonval]

FYI
The html report web page of Playwright are defined there: https://github.com/microsoft/playwright/tree/master/src/web/htmlReport
The HTML Reporter is defined there: https://github.com/microsoft/playwright/blob/master/src/test/reporters/html.ts

[jtpio]

With jupyterlab/jupyterlab#10796 and #81 Galata is now producing a Playwright HTML report directly.

@mbektas Would you like to report this issue as a feature request on the upstream Playwright repo?

[fcollonval]

A candidate for that could be: https://www.npmjs.com/package/react-image-diff

[mbektas]

thanks @jtpio and @fcollonval, let me research how Playwright reports work and we can consider an enhancement built into that. I will close this issue for now.