Introduce whitelisted folders for external data validation #8734

Job	Run time
2. Build Minimal (Exceptions Disabled)	9m 41s
6a. Build Regular (No Optional Features)	12m 3s
5. Build Extended Minimal	10m 8s
6b. Build Minimal (No Optional Features)	7m 14s
1. Build Full ORT and Generate ORT Files	17m 15s
4. Build Minimal (Globally Allowed Types)	8m 19s
6c. Build Extended Minimal (No Optional Features)	7m 28s
3a. Build Minimal (Custom Ops)	8m 56s
7. Build Extended Minimal (Android NNAPI)	10m 4s
3b. Build Minimal (Type Reduction)	8m 52s
	1h 40m 0s

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