chore: Rename incidentdate to occurreddate in DB [TECH-1665]

[enricocolasante]

Following on #15687

This PR aims to replace all occurrences of incidentDate in the DB and repository layer to occurredDate.
The general rule that we are using is that date fields are suffixed with At in the API and then suffixed with Date in the service and the DB layer.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
24.2% Duplication

[codecov]

Codecov Report

Merging #15700 (ffbce21) into master (0adbc6a) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #15700   +/-   ##
=========================================
  Coverage     66.21%   66.21%           
+ Complexity    31281    31276    -5     
=========================================
  Files          3483     3483           
  Lines        129910   129910           
  Branches      15181    15181           
=========================================
+ Hits          86021    86022    +1     
+ Misses        36808    36801    -7     
- Partials       7081     7087    +6     

Flag	Coverage Δ
integration	49.92% <80.00%> (-0.01%)	⬇️
integration-h2	32.31% <35.00%> (+0.02%)	⬆️
unit	30.28% <15.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ics/table/JdbcEnrollmentAnalyticsTableManager.java	94.91% <100.00%> (ø)
...nalytics/table/JdbcEventAnalyticsTableManager.java	81.66% <100.00%> (ø)
...table/JdbcTeiEnrollmentsAnalyticsTableManager.java	88.23% <100.00%> (ø)
...rg/hisp/dhis/program/DefaultEnrollmentService.java	53.20% <100.00%> (ø)
...ava/org/hisp/dhis/program/DefaultEventService.java	27.17% <100.00%> (ø)
.../org/hisp/dhis/program/variable/vIncidentDate.java	100.00% <100.00%> (ø)
...ker/trackedentity/store/query/EnrollmentQuery.java	98.14% <100.00%> (ø)
...hisp/dhis/tracker/export/event/JdbcEventStore.java	85.43% <100.00%> (ø)
...ort/trackedentity/HibernateTrackedEntityStore.java	68.19% <100.00%> (ø)
...ggregates/mapper/EnrollmentRowCallbackHandler.java	97.77% <100.00%> (ø)
... and 3 more

... and 8 files with indirect coverage changes

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