fix(UI-TEST/tasklist): amend tests to new layout

amend tests due to refactoring #CAM-2779
chore(pa-invoice): add checkboxes to invoice pa
chore(rest): update class name used in JAX-RS application

related to CAM-2996
fix(case): fix case example
chore(login): couple app authorization check to engine auth config

related to CAM-1534
test(login): test access authorization check on login

related to CAM-1534
chore(standalone): add spin process engine plugin

- also adds plugin to dev setup

related to CAM-2966
chore(pom): remove hard spin dependency

related to CAM-2966
chore(pom): add connect dependency to standalone webapps

- also add connect plugin to process engine configuration to
  standalone webapps

related to #CAM-2706
chore(webapp): generated form
fix(UI-TEST/tasklist): amend urls-spec
chore(UI-TEST/cockpit): add suspension elements
chore(pom): adjust spin/connect dependencies

related to #CAM-3061
chore(pom): add slf4j to develop profile
chore(spin/connect): process engine class names
 chore(release): Prepare release: set version to 7.2.0-alpha6
 chore(release): Prepare next development version: 7.2.0-SNAPSHOT
fix(UI-TEST/tasklist): fix filter spec

related to #CAM-2982
chore(core): enable querying for entities by number variables

related to CAM-2939
chore(plugin): add cockpit plugins

related to #CAM-3130