fix(admin credential): update document download endpoint

Description

Update document download functionality on the page /admin-credential

Why

Currently, the document download feature on the page /admin-credential is not functioning correctly. This issue is due to the connection with the outdated backend endpoint {portalhostname}/api/administration/documents/{documentID}. We need to switch to the new provided endpoint {issuercomponenthostname}/credentialRequest/documents/{documentId} located inside the issuer component, instead of the portal backend.

Issue

https://github.com/eclipse-tractusx/portal-frontend/issues/763

Checklist

Please delete options that are not relevant.

[X] I have followed the contributing guidelines
[X] I have performed a self-review of my own code
[X] I have successfully tested my changes locally

eclipse-tractusx / portal-frontend