typing: set no_implicit_reexport

In Python, if module A defines a name `name`, and module B does `import
name from A`, then another module C can `import name from B`.

Sometimes it is intentional -- module B is meant to "reexport" `name`.
But sometimes it is just confusion/inconsistency on where `name` should
be imported from.

mypy has a flag `--no-implicit-reexport` which puts some order into
this. A name can only be imported from a module if

1. The module defines the name
2. The module's `__all__` includes the name
3. The module imports the name as `from ... import .. as name`.

This flag is included in mypy's `--strict` flag.

I like this flag, but I realize it is a bit controversial, and in
particular item 3 above is a bit unfriendly to contributors who don't
know about it. So I didn't intend to add it to pytest.

But while investigating issue 7589 I came upon mypy issue 8754 which
causes `--no-implicit-reexport` to leak into installed libraries and
causes some unexpected typing differences *in pytest* if the user uses
this flag.

Since the diff mostly makes sense, let's just conform to it.

src/_pytest/python.py

@@ -32,6 +32,7 @@ from _pytest import nodes
 from _pytest._code import filter_traceback
 from _pytest._code import getfslineno
 from _pytest._code.code import ExceptionInfo
+from _pytest._code.code import TerminalRepr
 from _pytest._io import TerminalWriter
 from _pytest._io.saferepr import saferepr
 from _pytest.compat import ascii_escaped
@@ -66,7 +67,6 @@ from _pytest.pathlib import import_path
 from _pytest.pathlib import ImportPathMismatchError
 from _pytest.pathlib import parts
 from _pytest.pathlib import visit
-from _pytest.reports import TerminalRepr
 from _pytest.warning_types import PytestCollectionWarning
 from _pytest.warning_types import PytestUnhandledCoroutineWarning
 
@@ -581,7 +581,7 @@ class Module(nodes.File, PyCollector):
                 "Traceback:\n"
                 "{traceback}".format(fspath=self.fspath, traceback=formatted_tb)
             ) from e
-        except _pytest.runner.Skipped as e:
+        except skip.Exception as e:
             if e.allow_module_level:
                 raise
             raise self.CollectError(