Introduce whitelisted folders for external data validation #8723

Job	Run time
6b. Build Minimal (No Optional Features)	7m 18s
5. Build Extended Minimal	10m 19s
2. Build Minimal (Exceptions Disabled)	9m 44s
6c. Build Extended Minimal (No Optional Features)	7m 34s
6a. Build Regular (No Optional Features)	12m 7s
1. Build Full ORT and Generate ORT Files	17m 27s
4. Build Minimal (Globally Allowed Types)	8m 15s
7. Build Extended Minimal (Android NNAPI)	9m 16s
3b. Build Minimal (Type Reduction)	8m 8s
3a. Build Minimal (Custom Ops)	8m 25s
	1h 38m 33s

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