UI: Expose view rotation lock in the 3D Viewport

Expose view rotation lock in the View panel.

This is handy to prevent accidentally changing
the rotation of the viewport.

Pull Request: https://projects.blender.org/blender/blender/pulls/122185

scripts/startup/bl_ui/space_view3d.py

@@ -6202,6 +6202,7 @@ class VIEW3D_PT_view3d_lock(Panel):
         if not lock_object:
             col.prop(view, "lock_cursor", text="To 3D Cursor")
         col.prop(view, "lock_camera", text="Camera to View")
+        col.prop(view.region_3d, "lock_rotation", text="Rotation")
 
 
 class VIEW3D_PT_view3d_cursor(Panel):