[3.x] Fix multiple ubershader bugs #64096
Merged
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I've kept the fixes in separate commits, since each one addresses one specific issue, and I believe this way is better to convey information to future maintainers.
This mostly reverts the approach in [3.5] Avoid GL undefined behavior in ubershaders #62628, which now the problem is better scoped, looks overengineered and instead focuses on the few cases where there's something to take care of.
Fixes #63346.
Fixes #64040.