DOM renderer playwright tests

[Tyriar]

Fixes #4767

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Summary:

• Webgl api tests have been migrated to @playwright/test
• A new script was added to run all tests, I tried to set up the core config to run both core and addon tests but couldn't figure it out. Anyway the new script is quite robust
• Webgl tests have been made generic and are now shared between the new webgl test suite and the old webgl suite
• Refined the method of checking pixel colors, this speeds things up quite a bit as each frame now only needs to be fetched once. This uses lunapaint/png-codec to decode the image on the node side.
• Renderer tests now pass in webkit (there's a single skipped renderer test WebKit playwright test failure: minimumContrastRatio - should enforce half the contrast for dim cells #4769)
• Improved diagnostics when running playwright tests with DEBUG=1