Introduce whitelisted folders for external data validation #20684

Job	Run time
iphone_simulator (arm64)	1h 11m 28s
coreml / build-and-test (arm64, arm64, Debug)	1h 3m 32s
xnnpack / build-and-test (arm64, arm64, Debug)	1h 6m 24s
iphone_simulator (x86_64)	44m 54s
cpu / build-and-test (arm64, arm64, Release)	57m 44s
Objective-C-StaticAnalysis	3m 35s
cpu / build-and-test (arm64, arm64, Debug)	1h 30m 58s
webgpu / build-and-test (arm64, x86_64, Release)	55m 4s
coreml / build-and-test (arm64, arm64, Release)	1h 2m 14s
webgpu / build-and-test (arm64, arm64, Release)	59m 49s
webgpu / build-and-test (arm64, arm64, Debug)	1h 10m 53s
coreml / build-and-test (arm64, x86_64, Release)	45m 41s
	11h 32m 16s

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