Summary:
Changelog: [Internal][iOS] Minor: Rename RCTNotAllowedInAppWideFabric to RCTNotAllowedInFabricWithoutLegacy
`RCTNewArchitectureValidationPlaceholder(RCTNotAllowedInBridgeless` is to track Bridge APIs that are okay in Fabric but not in Bridgeless.
`RCTNewArchitectureValidationPlaceholder(RCTNotAllowedInFabricWithoutLegacy` is to track legacy APIs that should not exist if the app was using Fabric **without any legacy architecture**. e.g. RCTBridgeModule, legacy interop view components.
Reviewed By: fkgozali
Differential Revision: D37659105
fbshipit-source-id: aee4e083820e83a8dac19eb3b5efc49b37d90039