Revert changes from main commits that were merged into blender-v4.1-release

The last good commit was f57e4c5b98.

After this one more fix was committed, this one is preserved as well:
67bd678887.

scripts/modules/bpy/utils/toolsystem.py

@@ -2,10 +2,6 @@
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-__all__ = (
-    "ToolDef",
-)
-
 # Until we untangle ToolDef from bl_ui internals,
 # use this module to document ToolDef.
 from bl_ui.space_toolsystem_common import ToolDef