Remove undefined function in documentation

Merge 3.26

[pyramid/ctl] pyramid command will always run in foreground from now on Daemonization used to make sens in the past, but today "pyramid" command is only used for dev and should never be used for deployement (you should use a wsgi server for that instead) so daemonization doesn't fit any use case anymore. Closes #17232923

[clean] remove pyramid warning about looping task This warning isn't useful anymore.

[doc] add instruction to re-enable ckeditor

[fix] reference to underclared and unused variable kwargs

Avoid to update inlined relation column to NULL when deleting entities When deleting entities, cubicweb run a rql DELETE on all relations to trigger hooks. For an inlined relation this also mean set the column to NULL. This operation may fail if there's additional constraints on the column. Also this is a weird and useless behavior since deleting the entity row will by definition delete the relation. We still doesn't handle the case where both subject and object are going to be deleted because rows need to be deleted in a particular order that cubicweb doesn't handle. Add a test checking UPDATE does not occur but hooks are correctly called. Closes #17236690

Drop useless ConstraintInsertionTC This test does nothing and is here from the begining of repo history. Now it raise an error "TypeError: Skipped expected string as 'msg' parameter, got 'SkipTest' instead. Perhaps you meant to use a mark?" Just drop it.