WebGPURenderer: Video flipY and update and wrong colorSpace with WebGLBackend

[RenaudRohlinger]

Description

Issues:

• When using the WebGL backend in Three.js examples, resizing an example containing a video results in the video being flipped vertically (flipY).
• Videos are displayed with an incorrect colorSpace, but this issue only affects the WebGL backend.

Example:
You can observe this behavior in any webgpu video example:
Video Panorama Equirectangular Example

[RenaudRohlinger]

Resolved with #29254 and #29255.