TMDM-7769: "Show a percentage instead of a number in the match stats"

Updates data statistics service to return percentage of entity along count.
(https://jira.talendforge.org/browse/TMDM-7769)
TMDM-7769: "Show a percentage instead of a number in the match stats"

Updates data statistics service to return percentage of entity along count.
(https://jira.talendforge.org/browse/TMDM-7769)
TMDM-7769: "Show a percentage instead of a number in the match stats"

Fix incorrect JSON format (missing array start).
(https://jira.talendforge.org/browse/TMDM-7769)
Merge branch 'feature/5.6/TMDM-7769' of https://github.com/Talend/tmdm-server-se into feature/5.6/TMDM-7769

Conflicts:
	org.talend.mdm.core/src/com/amalto/core/storage/services/DataStatistics.java
TMDM-7769: "Show a percentage instead of a number in the match stats"

Prevents divide by zero in data statistics.
(https://jira.talendforge.org/browse/TMDM-7769)
TMDM-7769: show percentage as ##.## formatted number on y-axis
TMDM-7769 Show a percentage instead of a number in the match stats
- Fix frontend json data parsing for DataChart(entity count) due to rest service change (added percentage)
Merge branch 'feature/5.6/TMDM-7769' into maintenance/5.6