[r8-obfuscation] Keep runtime-owned JNI types - #12645
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Related to #12535
Depends on #12634
This is layer 7 above the existing six-layer R8 JNI name-obfuscation stack. It centralizes the CoreCLR/NativeAOT-owned JNI names that native startup and pre-remapping runtime code consume, and replaces broad runtime namespace keeps with explicit audited coverage on the opt-in obfuscation path.
The rules protect runtime-owned bootstrap classes, interfaces, fields, constructors, and methods without pinning ordinary generated application peers, preserving the existing seed/final mapping and JNI rewriting flow.