typing: suppress bogus pytype errors in `mercurial/wireprotov1peer.py`

Fixes:

    File "/mnt/c/Users/Matt/hg/mercurial/wireprotov1peer.py", line 100, in result:
        No attribute '_peerexecutor' on unsentfuture [attribute-error]
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotov1peer.py", line 278, in close:
        No attribute 'shutdown' on None [attribute-error]
    Called from (traceback):
      line 123, in __exit__
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotov1peer.py", line 278, in close:
        No attribute 'shutdown' on None [attribute-error]
      In Optional[concurrent.futures.thread.ThreadPoolExecutor]

We drop the zope decorator on `peerexecutor`, because otherwise it triggers this
error:

    File "/tmp/mercurial-ci/mercurial/wireprotov1peer.py", line 111, in <module>:
        Invalid type annotation  [invalid-annotation]
      Must be constant

Not sure why, because the decorated classes usually get typed as `Any`, which
would also be fine here.

mercurial/wireprotov1peer.py

@@ -93,6 +93,8 class unsentfuture(futures.Future):
     call ``sendcommands()``.
     """
 
+    _peerexecutor: "peerexecutor"
+
     def result(self, timeout=None):
         if self.done():
             return futures.Future.result(self, timeout)
@@ -105,7 +107,7 class unsentfuture(futures.Future):
         return self.result(timeout)
 
 
[e-mail](repository.ipeercommandexecutor)
+# @interfaceutil.implementer(repository.ipeercommandexecutor)
 class peerexecutor:
     def __init__(self, peer):
         self._peer = peer
@@ -275,6 +277,9 class peerexecutor:
         try:
             self._responsef.result()
         finally:
+            # Help pytype- this is initialized by self.sendcommands(), called
+            # above.
+            assert self._responseexecutor is not None
             self._responseexecutor.shutdown(wait=True)
             self._responsef = None
             self._responseexecutor = None