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

[guillaumejparis]

Close #1697

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 73 lines in your changes missing coverage. Please review.

Project coverage is 32.10%. Comparing base (5ff61ad) to head (07ea3fc). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/java/io/openbas/rest/statistic/StatisticApi.java	0.00%	70 Missing :warning:
...bas/rest/statistic/response/PlatformStatistic.java	0.00%	3 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1698      +/-   ##
============================================
- Coverage     32.20%   32.10%   -0.11%     
- Complexity     1609     1610       +1     
============================================
  Files           561      561              
  Lines         16776    16841      +65     
  Branches        964      973       +9     
============================================
+ Hits           5403     5407       +4     
- Misses        11129    11190      +61     
  Partials        244      244              

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[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.