fix(did): adjust did url

[Phil91]

Description

Adjust the url used to create the did to portal backend

Why

the call must go against the portal backend api instead of the portal itself

Issue

N/A

Checklist

• I have performed a self-review of my changes
• I have successfully tested my changes
• I have added comments in the default values.yaml file with helm-docs syntax ('# -- ') if relevant for installation
• I have commented my changes, particularly in hard-to-understand areas