chore: Add API ping request ignoring config

[netroms]

Summary

Adds back, configuration to ignore authentication on calls to /api/ping endpoint. This was lost during the migration to non deprecated Spring security config.

Manual test

1. Call endpoint /api/ping (without being logged in first)
2. Observe call is executed and returns 200

[sonarqubecloud]

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

[david-mackessy]

having a test for it would mean we would catch it if it's ever mistakenly changed in future

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0b2fe0d) 66.53% compared to head (c56fb38) 66.54%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #16212   +/-   ##
=========================================
  Coverage     66.53%   66.54%           
- Complexity    31697    31701    +4     
=========================================
  Files          3519     3519           
  Lines        131328   131331    +3     
  Branches      15303    15303           
=========================================
+ Hits          87385    87391    +6     
+ Misses        36817    36815    -2     
+ Partials       7126     7125    -1     

Flag	Coverage Δ
integration	50.07% <0.00%> (+<0.01%)	⬆️
integration-h2	32.68% <100.00%> (+<0.01%)	⬆️
unit	30.34% <0.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
...i/security/config/DhisWebApiWebSecurityConfig.java	93.06% <100.00%> (+0.05%)	⬆️

... and 3 files with indirect coverage changes

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