chore: fix warnings in tracker code

[teleivo]

• use switch expressions. They simplify our code. They also need to be exhaustive, so in case we add a new value to an enum we will get a compilation error that we are missing a case
• remove unused constants
• remove private and final if these are already provided by lombok

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (64c54cf) 66.37% compared to head (a387510) 66.36%.
Report is 25 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16079      +/-   ##
============================================
- Coverage     66.37%   66.36%   -0.01%     
+ Complexity    31523    31515       -8     
============================================
  Files          3507     3507              
  Lines        130594   130562      -32     
  Branches      15238    15237       -1     
============================================
- Hits          86676    86652      -24     
+ Misses        36848    36842       -6     
+ Partials       7070     7068       -2     

Flag	Coverage Δ
integration	50.30% <51.16%> (+<0.01%)	⬆️
integration-h2	32.36% <13.95%> (-0.01%)	⬇️
unit	30.34% <74.41%> (-0.01%)	⬇️

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

Files	Coverage Δ
...cker/export/enrollment/EnrollmentEventsParams.java	100.00% <ø> (ø)
...isp/dhis/tracker/imports/TrackerIdSchemeParam.java	100.00% <100.00%> (+9.09%)	⬆️
...sp/dhis/tracker/imports/TrackerIdSchemeParams.java	100.00% <100.00%> (ø)
...isp/dhis/tracker/imports/bundle/TrackerBundle.java	72.97% <100.00%> (+4.55%)	⬆️
...his/tracker/imports/domain/MetadataIdentifier.java	91.89% <100.00%> (+5.04%)	⬆️
...p/dhis/tracker/imports/preheat/TrackerPreheat.java	90.17% <100.00%> (+1.09%)	⬆️
.../org/hisp/dhis/tracker/imports/report/Warning.java	100.00% <ø> (ø)
...tracker/imports/validation/PersistablesFilter.java	96.74% <100.00%> (ø)
...idation/validator/TrackerImporterAssertErrors.java	0.00% <ø> (ø)
...orts/validation/validator/event/DateValidator.java	90.69% <100.00%> (ø)
... and 2 more

... and 37 files with indirect coverage changes

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