[release/6.0-rc1] Give tvOS a special value for Personal/MyDocuments #58056
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Backport of #57508 to release/6.0-rc1
/cc @directhex
Customer Impact
Fixes two issues where tvOS devices have read-only directories which are read-write on other Apple platforms; SpecialFolders.Personal (and subdirectories thereof), and TMP.
Testing
Manual testing on Helix & local device
Risk
Low - makes minor changes to how temp folders are calculated on all iOS-like targets, which should be more futureproof if Apple stops allowing /tmp or TMP in an OS update
Fixes #34007
Fixes #57638
Backport of #57508 to release/6.0-rc1