[web] Build multiple CanvasKit variants (using toolchain_args) (#38448) * [web] New gn for building CanvasKit * Use toolchain_args to override CanvasKit gn args * Use correct path for the generated canvaskit files * Put toolchain close to target * remove extra toolchains * remove extra import * add canvaskit_lite to archive * fix local canvaskit path in tests * add some guards using visibility and asserts * renames * formatting * rename mistake * Add github issue to the TODO * Update buildroot sha * clang-tidy error * skip canvaskit targets when not needed
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