feat(compositor): factor output_format into GPU heuristic #551

Job	Run time
Skit / Test	10m 27s
Skit / Lint (fmt + clippy)	3m 57s
Skit / Build	12m 36s
Skit / Test (GPU)	1m 54s
UI / Knip (unused code)	16s
E2E / Playwright E2E	14m 49s
UI / Build	15s
Plugins / Lint (Whisper)	40s
UI / Lint (TypeScript + ESLint)	44s
Plugins / Lint (NLLB)	1m 58s
Plugins / Lint (Simple Plugins)	41s
Plugins / Lint (Sherpa-ONNX Plugins)	59s
Plugins / Format Check	16s
UI / Test	33s
All Checks Passed	2s
	50m 7s

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