runner: collapse exception handling in SetupState.teardown_exact()

This is equivalent but simpler.

src/_pytest/runner.py

@@ -443,29 +443,20 @@ class SetupState:
         while self.stack:
             if self.stack == needed_collectors[: len(self.stack)]:
                 break
-            try:
             colitem = self.stack.pop()
             finalizers = self._finalizers.pop(colitem)
             finalizers.insert(0, colitem.teardown)
-                inner_exc = None
             while finalizers:
                 fin = finalizers.pop()
                 try:
                     fin()
-                    except TEST_OUTCOME as e:
-                        # XXX Only first exception will be seen by user,
-                        #     ideally all should be reported.
-                        if inner_exc is None:
-                            inner_exc = e
-                for colitem in self._finalizers:
-                    assert colitem in self.stack
-                if inner_exc:
-                    raise inner_exc
                 except TEST_OUTCOME as e:
                     # XXX Only first exception will be seen by user,
                     #     ideally all should be reported.
                     if exc is None:
                         exc = e
+            for colitem in self._finalizers:
+                assert colitem in self.stack
         if exc:
             raise exc
         if nextitem is None: