TMDM-7975: "Previous execution tool bar becomes grayed after validation is over"

Fix incorrect handling of VALIDATION_END event.
(https://jira.talendforge.org/browse/TMDM-7975)
TMDM-7968: "match plan shows the constructed records score as empty"

Put at least one match result when a record has matched multiple records.
Update unit test asserts following behavior change.
(https://jira.talendforge.org/browse/TMDM-7968)
TMDM-7734 Show confidence percentage on webUI side.
TMDM-7963 mdm statistic data shows percentage not same with rest api's return value
- Use percentage value returned from rest service
https://jira.talendforge.org/browse/TMDM-7963
TMDM-7897 : Add logic to check entityModel value
TMDM-7970: "Statistics services should ignore all storage related errors"

Include staging area statistics service in changed services.
(https://jira.talendforge.org/browse/TMDM-7970)
TMDM-7975: "Previous execution tool bar becomes grayed after validation is over"

Ensure task paging bar remains enabled after refresh.
(https://jira.talendforge.org/browse/TMDM-7975)
Merge branch 'maintenance/5.6'

Conflicts:
	org.talend.mdm.webapp.stagingarea/src/main/java/org/talend/mdm/webapp/stagingarea/control/client/view/PreviousExecutionView.java