[1.8-stable] Gated port: MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY child-process isolation (#5987) - #6631

[1.8-stable] Gated port: MICROSOFT_WINDOWSAPPRUNTIME_BASE_DIRECTORY child-process isolation (#5987)#6631

Scott Jones (Scottj1s) merged 2 commits into

release/1.8-stablemicrosoft/WindowsAppSDK:release/1.8-stablefrom

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