This option is meant to ignore any material locking when it
comes to editing strokes that might use locked materials.
There were some issues with the current implementation.
* The name did not reflect what it was supposed to do, so it
was renamed to `ignore_locked_materials`.
* The description of the option has been updated to better
reflect the behavior.
* Some util functions have been refactored
Pull Request: https://projects.blender.org/blender/blender/pulls/127423
c07c9d5729