fix: add role to cypress login

[ReneSchroederLJ]

Description

• added missing role (customer or supplier) to the login functions within customer and supplier test specs

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files
• If helm chart has been changed, the chart version has been bumped to either next major, minor or patch level (compared to released chart).

[tom-rm-meyer-ISST]

please add pr number to list in CHANGELOG.md

I tried it out, but again got timeout after timeout.

[tom-rm-meyer-ISST]

LGTM, thanks!