[6.2] AST: Diagnose unrecognized platforms as errors with CustomAvailability
enabled
#82083
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CustomAvailability
experimental feature is enabled, make it an error to specify an unrecognized availability domain name. Also, add these diagnostics to a diagnostic group so that developers can control their behavior when they are warnings.CustomAvailability
is enabled.CustomAvailability
enabled. #82075CustomAvailability
should not be enabled yet in any existing projects, and even if it were those projects would also have to contain references to non-existent availability domains in order to be rejected.