Add refresh to top-level __all__

This makes the git.refresh function unambiguously public.

git.refresh was already public in the sense that it was explicitly
documented as appropriate to call from code outside GitPython.
However, it had not been included in git.__all__.

Because __all__ existed but omitted "refresh", git.refresh had
appeared non-public to automated tools.

This also does some cleanup:

- It removes a comment that showed how git.__all__ had been defined
  dynamically before gitpython-developers#1659, since with the addition of "refresh",
  git.__all__ no longer contains exactly the same elements as that
  technique produced (as it examined the module's contents prior to
  running the def statement that bound the name "refresh").

- With that comment removed, it is no longer necessary to define
  __all__ below the imports to show what the dynamic techinque had
  operated on. So this moves it up above them in accordance with
  PEP-8.

git/__init__.py

@@ -5,38 +5,6 @@
 
 # @PydevCodeAnalysisIgnore
 
-__version__ = "git"
-
-from typing import List, Optional, Sequence, Tuple, Union, TYPE_CHECKING
-
-from gitdb.util import to_hex_sha
-from git.exc import *  # noqa: F403  # @NoMove @IgnorePep8
-from git.types import PathLike
-
-try:
-    from git.compat import safe_decode  # @NoMove @IgnorePep8
-    from git.config import GitConfigParser  # @NoMove @IgnorePep8
-    from git.objects import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.refs import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.diff import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.db import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.cmd import Git  # @NoMove @IgnorePep8
-    from git.repo import Repo  # @NoMove @IgnorePep8
-    from git.remote import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.index import *  # noqa: F403  # @NoMove @IgnorePep8
-    from git.util import (  # @NoMove @IgnorePep8
-        LockFile,
-        BlockingLockFile,
-        Stats,
-        Actor,
-        remove_password_if_present,
-        rmtree,
-    )
-except GitError as _exc:  # noqa: F405
-    raise ImportError("%s: %s" % (_exc.__class__.__name__, _exc)) from _exc
-
-# __all__ must be statically defined by py.typed support
-# __all__ = [name for name, obj in locals().items() if not (name.startswith("_") or inspect.ismodule(obj))]
 __all__ = [  # noqa: F405
     "Actor",
     "AmbiguousObjectName",
@@ -109,12 +77,43 @@
     "UnsupportedOperation",
     "UpdateProgress",
     "WorkTreeRepositoryUnsupported",
+    "refresh",
     "remove_password_if_present",
     "rmtree",
     "safe_decode",
     "to_hex_sha",
 ]
 
+__version__ = "git"
+
+from typing import List, Optional, Sequence, Tuple, Union, TYPE_CHECKING
+
+from gitdb.util import to_hex_sha
+from git.exc import *  # noqa: F403  # @NoMove @IgnorePep8
+from git.types import PathLike
+
+try:
+    from git.compat import safe_decode  # @NoMove @IgnorePep8
+    from git.config import GitConfigParser  # @NoMove @IgnorePep8
+    from git.objects import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.refs import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.diff import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.db import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.cmd import Git  # @NoMove @IgnorePep8
+    from git.repo import Repo  # @NoMove @IgnorePep8
+    from git.remote import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.index import *  # noqa: F403  # @NoMove @IgnorePep8
+    from git.util import (  # @NoMove @IgnorePep8
+        LockFile,
+        BlockingLockFile,
+        Stats,
+        Actor,
+        remove_password_if_present,
+        rmtree,
+    )
+except GitError as _exc:  # noqa: F405
+    raise ImportError("%s: %s" % (_exc.__class__.__name__, _exc)) from _exc
+
 # { Initialize git executable path
 GIT_OK = None