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fix: Firefox + Linux custom shader issue with glsl compiler attribute optimization (#2943)

This PR fixes an issue where Firefox on Linux would throw an error when using custom Materials due to unused attributes caused by glsl compiler optimization.


Before it would throw and crash excalibur

![image](https://github.com/excaliburjs/Excalibur/assets/612071/6b6a3f55-d260-4663-92d7-39ac8e3aa497)

Now after, it will log a warning because this is potentially a bug, or at minimum something you should look at

![image](https://github.com/excaliburjs/Excalibur/assets/612071/4eb162c2-b559-4923-81e7-8723b758de36)

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