Revert "[stdlib][Distributed] Add primary associated types for distributed actor protocols"

This reverts commit eed5bd1.

(cherry picked from commit 1df918e)

Author: lorentey

stdlib/public/Distributed/DistributedActor.swift

@@ -41,7 +41,7 @@ import _Concurrency
 /// Use the `CodingUserInfoKey.actorSystemKey` to provide the necessary
 /// actor system for the decoding initializer when decoding a distributed actor.
 @available(SwiftStdlib 5.7, *)
-public protocol DistributedActor<ActorSystem>: AnyActor, Identifiable, Hashable
+public protocol DistributedActor: AnyActor, Identifiable, Hashable
   where ID == ActorSystem.ActorID,
         SerializationRequirement == ActorSystem.SerializationRequirement {
 

stdlib/public/Distributed/DistributedActorSystem.swift

@@ -14,7 +14,7 @@ import _Concurrency
 
 /// A distributed actor system
 @available(SwiftStdlib 5.7, *)
-public protocol DistributedActorSystem<SerializationRequirement>: Sendable {
+public protocol DistributedActorSystem: Sendable {
   /// The identity used by actors that communicate via this transport
   associatedtype ActorID: Sendable & Hashable
 
@@ -445,7 +445,7 @@ func _executeDistributedTarget<D: DistributedTargetInvocationDecoder>(
 /// so decoding can rely on simply invoking e.g. `Codable` (if that is the `SerializationRequirement`) decoding
 /// entry points on the provided types.
 @available(SwiftStdlib 5.7, *)
-public protocol DistributedTargetInvocationEncoder<SerializationRequirement> {
+public protocol DistributedTargetInvocationEncoder {
   associatedtype SerializationRequirement
 
   /// The arguments must be encoded order-preserving, and once `decodeGenericSubstitutions`
@@ -518,7 +518,7 @@ public struct RemoteCallArgument<Value> {
 /// Decoder that must be provided to `executeDistributedTarget` and is used
 /// by the Swift runtime to decode arguments of the invocation.
 @available(SwiftStdlib 5.7, *)
-public protocol DistributedTargetInvocationDecoder<SerializationRequirement> {
+public protocol DistributedTargetInvocationDecoder {
   associatedtype SerializationRequirement
 
   mutating func decodeGenericSubstitutions() throws -> [Any.Type]
@@ -548,9 +548,7 @@ public protocol DistributedTargetInvocationDecoder<SerializationRequirement> {
 }
 
 @available(SwiftStdlib 5.7, *)
-public protocol DistributedTargetInvocationResultHandler<
-  SerializationRequirement
-> {
+public protocol DistributedTargetInvocationResultHandler {
   associatedtype SerializationRequirement
 //  func onReturn<Success: SerializationRequirement>(value: Success) async throws