De-quarantine SDK executables in the macOS setup script

[stephanosio]

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macOS, by default, sets the quarantine attribute (com.apple.quarantine) to the files downloaded from the web, and the Gatekeeper displays an annoying warning message whenever the SDK executables are launched:

Update the macOS distribution bundle setup script to remove the quarantine attribute from all SDK executables during setup.

See also: https://docs.zephyrproject.org/latest/develop/getting_started/installation_mac.html#important-note-about-gatekeeper