Fix gles texture uniform array binding

[ChibiDenDen]

Fix both texture uniform binding and texture object binding in gles (compatibility ) mode for godot 4

Before this change, the engine (editor / game) crashes whenever there is an array of sampler2D in compatibility mode

The following line in any shader crashes:
uniform sampler2D[10] textures;

Production edit: Fixes #76463

[YuriSizov]

Thanks for opening a pull request! Please squash your commits into a single one. Make sure that the commit message stays short but descriptive (your original message and the title of this PR are a good option).

And to your knowledge, does this address any open issue?

[ChibiDenDen]

@YuriSizov thanks, I squashed the commits.
I tried to look at the open issues for keywords like "shader array" "shader crash" "sampler array" "sampler2d" and couldn't find anything similar, might have missed something though.

Should I open an issue describing the bugs fixed here?

[YuriSizov]

Should I open an issue describing the bugs fixed here?

No, it's not necessary at this point. I was mostly curious if this would reduce our backlog of existing issues :)

[clayjohn]

Looks really good! I just have one little requested change because we try to avoid using auto unless absolutely necessary.

[clayjohn]

This looks good to go, it just needs to be rebased to resolve conflicts

[YuriSizov]

Thanks!