[backend] Adding a new "health" endpoint (#1850)

[heditar]

Proposed changes

• Adding a new "health" endpoint that will return 200 if the service is healthy otherwise 5xx

Related issues

• Closes Introduce /health endpoint #1850

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 16 lines in your changes missing coverage. Please review.

Project coverage is 34.16%. Comparing base (756dd1e) to head (3bc5843).
Report is 1 commits behind head on release/1.10.0.

Files with missing lines	Patch %	Lines
...in/java/io/openbas/service/HealthCheckService.java	57.57%	14 Missing ⚠️
...a/io/openbas/rest/health_check/HealthCheckApi.java	87.50%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/1.10.0    #1950      +/-   ##
====================================================
+ Coverage             34.03%   34.16%   +0.12%     
- Complexity             1303     1315      +12     
====================================================
  Files                   519      522       +3     
  Lines                 15661    15716      +55     
  Branches                972      975       +3     
====================================================
+ Hits                   5330     5369      +39     
- Misses                10070    10084      +14     
- Partials                261      263       +2     

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[antoinemzs]

A couple nitpicks but solid work overall, thanks!