fix(qa): adjust DashboardIT to modified invoice example

related to #CAM-2800
chore(integration-test): workaround for non-public Connect API

related to CAM-3061
chore(spin/connect): process engine class names
chore(generated/form): add error message when value is invalid

related to CAM-3002
chore(example): imporve filter label

related to #CAM-2800
chore(pom): set alpha versions of spin and connect
 chore(release): Prepare release: set version to 7.2.0-alpha6
 chore(release): Prepare next development version: 7.2.0-SNAPSHOT