Modernize onboard-db-init-docker image

Modernize onboard-db-init-docker image

- use python:3.11-alpine image instead of onap/policy-jdk-alpine:2.4.4
- jdk is not needed in the image since the image is used to run cqlsh
  commands that is installed via python
- this updates the python version from 3.9 to 3.11
- this reduces the image size from 670MB to 75MB
- improve ui tests reliability by increasing a wait timeout
  and catching broader exceptions on the VspValidationPage

Issue-ID: SDC-4784
Signed-off-by: Fiete Ostkamp <fiete.ostkamp@telekom.de>
Change-Id: I8e464c7b5fa3ea2e59ccb1a46a432220978b1ca7