Merge pull request #71050 from hborla/global-actor-unsafe

[Concurrency] Deprecate `@GlobalActor(unsafe)` in favor of `@preconcurrency @GlobalActor`

lib/Sema/ConstraintSystem.cpp

@@ -7713,7 +7713,6 @@ ConstraintSystem::inferKeyPathLiteralCapability(KeyPathExpr *keyPath) {
       // A reference to an actor isolated state make key path non-Sendable.
       case ActorIsolation::ActorInstance:
       case ActorIsolation::GlobalActor:
-      case ActorIsolation::GlobalActorUnsafe:
         isSendable = false;
         break;
       }