Edge Module VCL upload missing Request errors logs

Problem/Motivation

When trying to upload Edge Modules VCL using th UI, requests errors, like for example token scope issue, are not printed out in the page nor in the watchdog.

Steps to reproduce

Try to upload a new Edge Module VCL "Disable Caching" rule and save/send VCL.

The message "There were errors while trying to enable/update Edge module".

Proposed resolution

The message "There were errors while trying to enable/update Edge module" is useless as it is not pointing was the issue was. The relavant API issue could be logged on the request return and just log the error message to the watchdog, or to the messenger service.

Remaining tasks

User interface changes

API changes

Data model changes