fix(cockpit): refresh view on selection in a proper way in cockpit

related to CAM-1864
feat(engine/history): log user task operations

- Introduce new User Operation Log logging operations
  performed by a user (such as "claim task")

- Populate Operation Log with Task Operations

- Deprecate TaskService.getTaskEvents(): evnets are now retreived
  from Operation Log instead of Comment Table

- Provide Query for operation log.

- Provide Sql migration scripts.

related to #CAM-1756, #CAM-1758, #CAM-1700
fix(engine): string concat on mysql

use mysql "CONCAT(...)" function instead of ANSI "||"

related to #CAM-1758
fix(engine/ci): exclude TaskEventsTest for hist levels
fix(engine): timestamps mysql
improve(cockpit/tree): adjust layout of root activity instance

related to CAM-1849
chore(tomcat/distro): remove unnecessary dependency

related to CAM-1860
improve(cockpit/tree): change the activity state icons
fix(cockpit): fix the color of layout splitter
chore(ci): fix history level check
fix(cockpit/login): set the page title correctly on login page
fix(cockpit/page title): avoid using the page service for login page
fix(cockpit/page title): fix page title when logged out
chore(webapp/title): set proper page title when logged out

related to CAM-1779
impr(cockpit/tree): change the 	activty state icons

related to CAM-1886
improve(cockpit/tree): set border to none on remove button
fix(cockpit/dateFilter): initialize filterData properly
impr(engine/log): generalize creation of user operation log events

related to CAM-1756
fix(cockpit/filter): add filter type specific CSS classes
 chore(release): Prepare release: set version to 7.1.0-alpha3