The detailed dumps of original and patched item content was useful
while developing the feature, but is less relevant now and too
verbose. It might be relevant again, so it's left in the code as
comments.
What gets logged now is just a single-line "creating" resp. "deleting"
message with the type of the item and its unique name.
This also enhances up some other aspects of the original logging:
- the namespace is included for item types that are namespaced
- the "deleting" message no longer gets replicated in each factory
method
Fixes: #70448
84db64fbcc