[frontend/backend] fix and improve dashboard statistics (#1697)

[guillaumejparis]

Close #1697

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 85 lines in your changes missing coverage. Please review.

Project coverage is 33.09%. Comparing base (f4ae81f) to head (b0d15ea).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/java/io/openbas/rest/statistic/StatisticApi.java	0.00%	69 Missing ⚠️
...bas/rest/statistic/response/PlatformStatistic.java	0.00%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1698      +/-   ##
============================================
- Coverage     33.24%   33.09%   -0.15%     
  Complexity     1598     1598              
============================================
  Files           560      560              
  Lines         14605    14669      +64     
  Branches        894      903       +9     
============================================
  Hits           4855     4855              
- Misses         9519     9583      +64     
  Partials        231      231              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[RomuDeuxfois]

MITRE ATT&CK Coverage still empty on my side.
I have one simulation and one atomic testing

[RomuDeuxfois]

I am not sure, but this card seems to not working

[RomuDeuxfois]

Homogenize queries: base on 180 days for creation date and start date is not null.