Shader CMake cleanup #565

Job	Run time
Check for Max SDK	1s
linux-x64-internal-release	10m 15s
macos-arm64-internal-release	18m 16s
linux-x64-internal-debug	7m 50s
macos-arm64-internal-debug	13m 49s
linux-x64-external-release	8m 20s
macos-arm64-external-release	12m 27s
macos-x64-internal-release	16m 54s
macos-x64-internal-debug	15m 35s
macos-x64-external-release	14m 9s
windows-x86-internal-release	19m 17s
windows-x86-internal-debug	19m 1s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x86-external-release	14m 47s
windows-x64-internal-release	21m 46s
windows-x64-internal-debug	16m 19s
windows-x64-external-release	18m 4s
	3h 46m 50s

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