Remove stb image shim header #4009

Job	Run time
pre-commit / pre-commit	1m 19s
ubuntu / clang-build (ubuntu-24.04)	53s
mac / clang-build (Debug)	1m 1s
mac / clang-build (Release)	1m 4s
ubuntu / clang-build (ubuntu-24.04-arm)	47s
ubuntu / gcc-build (ubuntu-24.04, Release)	48s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	49s
ubuntu / gcc-build (ubuntu-24.04, Debug)	54s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	46s
windows / msvc-build (Release)	54s
windows / clang-build	52s
windows / msvc-build (Debug)	53s
windows / clang-test	1s
windows / clang-test-extended	1s
ubuntu / clang-sanitizer-test	1s
ubuntu / clang-sanitizer-test-extended	1s
ubuntu / clang-sanitizer-build	1s
ubuntu / clang-test-extended	1s
ubuntu / clang-test	1s
ubuntu / gcc-test-extended	1s
ubuntu / gcc-test	1s
ubuntu / gcc-build-codecov	1s
windows / msvc-test	1s
windows / msvc-test-extended	1s
mac / clang-test-extended	1s
perf	0s
pages	0s
mac / clang-test	1s
	11m 14s

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