Only revert the new NIO test on the macOS CI

Author: finagolfin

swift-nio-revert-async.patch

@@ -1,56 +1,3 @@
-diff --git a/Sources/NIOCore/AsyncSequences/NIOAsyncWriter.swift b/Sources/NIOCore/AsyncSequences/NIOAsyncWriter.swift
-index badc34f967..f232d518f9 100644
---- a/Sources/NIOCore/AsyncSequences/NIOAsyncWriter.swift
-+++ b/Sources/NIOCore/AsyncSequences/NIOAsyncWriter.swift
-@@ -1173,7 +1173,38 @@ extension NIOAsyncWriter {
-                     delegate: delegate
-                 )
- 
--            case .initial, .finished, .writerFinished:
-+            case .writerFinished(
-+                let isWritable,
-+                let inDelegateOutcall,
-+                var suspendedYields,
-+                let cancelledYields,
-+                let bufferedYieldIDs,
-+                let delegate,
-+                let error
-+            ):
-+                // We have a suspended yield at this point that hasn't been cancelled yet.
-+                // It was buffered before we became finished, so we still have to deliver it.
-+                // We need to store the yield now.
-+
-+                self._state = .modifying
-+
-+                let suspendedYield = SuspendedYield(
-+                    yieldID: yieldID,
-+                    continuation: continuation
-+                )
-+                suspendedYields.append(suspendedYield)
-+
-+                self._state = .writerFinished(
-+                    isWritable: isWritable,
-+                    inDelegateOutcall: inDelegateOutcall,
-+                    suspendedYields: suspendedYields,
-+                    cancelledYields: cancelledYields,
-+                    bufferedYieldIDs: bufferedYieldIDs,
-+                    delegate: delegate,
-+                    error: error
-+                )
-+
-+            case .initial, .finished:
-                 preconditionFailure("This should have already been handled by `yield()`")
- 
-             case .modifying:
-@@ -1501,7 +1532,7 @@ extension NIOAsyncWriter {
- 
-                     self._state = .writerFinished(
-                         isWritable: isWritable,
--                        inDelegateOutcall: inDelegateOutcall,
-+                        inDelegateOutcall: false,
-                         suspendedYields: .init(),
-                         cancelledYields: cancelledYields,
-                         bufferedYieldIDs: bufferedYieldIDs,
 diff --git a/Tests/NIOCoreTests/AsyncSequences/NIOAsyncWriterTests.swift b/Tests/NIOCoreTests/AsyncSequences/NIOAsyncWriterTests.swift
 index 31c680b8bf..4f15ac9af9 100644
 --- a/Tests/NIOCoreTests/AsyncSequences/NIOAsyncWriterTests.swift