cubicweb-seda #13813234 Modify ArchivalAgreement into text field [validation pending]

Archival Agreement must be a text zone (not a list).

prioritynormal
typeenhancement
done in0.4.0
load left0.000
closed by#0ade3a6163ea [code gen] Archival Agreement should now be a string
patch[code gen] Archival Agreement should now be a string [applied]