Mesh: Fix back compat for sideOrientation when parsing mesh

[Popov72]

See https://forum.babylonjs.com/t/new-versions-7-10-7-11-have-errors-with-model-normal-maps/51320/6

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[Popov72]

The "NME Shadow Map" test fails in WebGL1 with a "Exceeded timeout of 40000 ms for a test." error, I don't really know why...

I already tried to restart the job, but with no luck.

[RaananW]

Shader error
https://dev.azure.com/babylonjs/ContinousIntegration/_build/results?buildId=32046&view=logs&j=7b404efb-7538-55b4-a782-4ea3884fcbf6&t=bf9ef5b9-af36-59b6-bc38-ebe764b12ced&l=4324

Would be better to fix this before merging, even though webgl1 is no longer mandatory.

[Popov72]

We don't support writing to gl_FragDepth in WebGL1, so I've removed the faulty test from the WebGL1 test suite.