Optional Vis-tests with browserstack

[RaananW]

This will enable CI testing with browserstack. This is optional and is only turned on if providing username, access key and browserType "BrowserStack".

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s). To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

Snapshot stored with reference name: refs/pull/15111/merge

Test environment: https://babylonsnapshots.z22.web.core.windows.net/refs/pull/15111/merge/index.html

To test a playground add it to the URL, for example:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/15111/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/15111/merge https://sandbox.babylonjs.com/?snapshot=refs/pull/15111/merge https://gui.babylonjs.com/?snapshot=refs/pull/15111/merge https://nme.babylonjs.com/?snapshot=refs/pull/15111/merge

To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/15111/merge#BCU1XR#0

[sebavan]

Cool is BS now stable ????

[RaananW]

seems to be working well apart from 3 webgpu and 1 webgl2 tests (which I am checking). I'll continue experimenting after this is merged.

[bjsplat]

Visualization tests for WebGPU (Experimental) Important - these might fail sporadically. This is an optional test.

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/15111/merge/testResults/webgpuplaywright/index.html

[bjsplat]

WebGL2 visualization test reporter:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/15111/merge/testResults/webgl2playwright/index.html