Revert "Enable loading of texture assets in unit tests"

[marklundin]

Fixes #6942
Reverts #6928

The 'node-canvas' doesn't compile on Apple Silicon, so npm install currently fails on OS X - Silicon. The PR reverts back to using the playcanvas/canvas-mock, until we find a better solution

[willeastcott]

Can't you just brew install those dependencies for now?

brew install pkg-config cairo pango libpng jpeg giflib librsvg

[LeXXik]

This is also failing on Windows 11. No brew here.

[marklundin]

We could do, but I guess we'd need to update the README.md to say something like

Ensure you have Brew installed

brew install pkg-config cairo pango libpng jpeg giflib librsvg
npm install

Not sure, seems a bit overkill for just the tests.

Haven't tested but Skia seems to work on Silicon https://www.npmjs.com/package/skia-canvas

[kungfooman]

Looks like this cairo.h error exists since 2021: Automattic/node-canvas#1773

Feels strange if we first need to build all kinds of fancy and often unused C++/Python hell deps in order to generate an engine build artifact - You can't use the highway in Australia because some side road in San Francisco is blocked! 😅

I guess we could add a new folder with an extra package.json that does install canvas NPM dependency for some extra tests that the previous Canvas mock wasn't capable of and somehow only test with that when it was possible to install canvas. Maybe using NPM postinstall hook for installing "error prone" deps or something. 💭

[marklundin]

Ok I will revert this whilst we consider alternatives, even if we do end up use a post-install