feat(digitalhub): dremio now uses coder email and an automatically generated password; core tests now take the token from core directly; kubeflow-pipelines now uses a separate bucket

[Calcagiara]

In this release:

• Dremio now takes the Coder user's email and sets it as the username for logging in. The password is now randomly generated, ensuring that it matches the creteria for a Dremio password. You can now see both username and password when you create the workspace.
• Tests for Core have been updated; now, the token request will be sent to Core itself.
• Kubeflow-Pipelines do not use the bucket datalake anymore; instead, a new bucket called kfp has been created to separated the stored artifacts