feat(engine): add followUpBeforeOrNotExistent to TaskQuery
related to CAM-2809
feat(engine): HistoryLevel-SPI

- add HistoryLevel SPI
- implement default, built-in HistoryLevels
- add possibility to implement custom history levels

The HistoryLevel SPI allows controlling which history events are
produced. Users can now fine-tune more easily what kind of data is
produced.

related to #CAM-2724, #CAM-1329
chore(parent): update commons and connect version
chore(qa): remove webapps e2e tests

moved to camunda-bpm-webapp repo
chore(sql): add index to improve job executor performance

- add to engine create and drop scripts
- add to upgrade scripts 7.1 - 7.2

related to #CAM-2802