[backend/frontend] get rabbitmq version and fix value in frontend

[guillaumejparis]

close #841

based on work by @Dimfacion

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 24.96%. Comparing base (583011e) to head (c6a4085).

Files	Patch %	Lines
...rc/main/java/io/openbas/helper/RabbitMQHelper.java	0.00%	20 Missing ⚠️
.../io/openbas/rest/settings/PlatformSettingsApi.java	0.00%	1 Missing ⚠️
...enbas/rest/settings/response/PlatformSettings.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #980      +/-   ##
============================================
- Coverage     25.01%   24.96%   -0.05%     
- Complexity      961      962       +1     
============================================
  Files           468      469       +1     
  Lines         10391    10413      +22     
  Branches        498      499       +1     
============================================
+ Hits           2599     2600       +1     
- Misses         7732     7752      +20     
- Partials         60       61       +1     

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