Helper method get clean data for value stores in a Media form field by removing adapter information
from the value if available (in this case, the value will have this format:
images/headers/blue-flower.jpg#joomlaImage://local-images/headers/blue-flower.jpg?width=700&height=180)
A special list of blocked executable extensions, skipping executables that are
typically executable in the webserver context as those are fetched from
Joomla\CMS\Filter\InputFilter