Add additional configuration for Sentry

[pierredup]

No description provided.

[what-the-diff]

PR Summary

• Added new environment variables for Sentry
  New environment variables have been included to configure the Sentry, which is a tool that helps monitor and fix crashes in real time.

• Updates to sentry and services configuration
  The configuration files of Sentry and of the service are updated to include these changes. This will control how and when the application will send out data for real time crash analysis.

• Added new file for Cron Schedule Events
  A new PHP file named CronScheduleEventSubscriber.php has been added. This file is responsible for subscribing to, and responding to, scheduled tasks (or Cron) events that happen within our application.

• Registered the new service in the services configuration
  The newly added CronScheduleEventSubscriber has been registered as a service in the services.yml configuration file. This means that it will now be globally available in the application, and can be utilized wherever required.

[codecov]

Codecov Report

Patch coverage: 21.05% and project coverage change: -0.20% ⚠️

Comparison is base (5d115d0) 50.97% compared to head (2a0f1e5) 50.77%.
Report is 11 commits behind head on 2.2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##              2.2.x     #938      +/-   ##
============================================
- Coverage     50.97%   50.77%   -0.20%     
- Complexity     2229     2239      +10     
============================================
  Files           442      443       +1     
  Lines          8295     8337      +42     
============================================
+ Hits           4228     4233       +5     
- Misses         4067     4104      +37     

Flag	Coverage Δ
unittests	50.77% <21.05%> (-0.20%)	⬇️

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

Files Changed	Coverage Δ
src/CoreBundle/ConfigWriter.php	0.00% <0.00%> (ø)
src/CoreBundle/Repository/VersionRepository.php	36.84% <0.00%> (ø)
...le/EventSubscriber/CronScheduleEventSubscriber.php	0.00% <0.00%> (ø)
src/InstallBundle/Action/Install.php	0.00% <0.00%> (ø)
src/InstallBundle/Command/InstallCommand.php	0.00% <0.00%> (ø)
src/UserBundle/Email/ResetPasswordEmail.php	0.00% <0.00%> (ø)
src/UserBundle/Repository/UserRepository.php	95.12% <0.00%> (ø)
src/CoreBundle/Config/Loader/EnvLoader.php	71.42% <63.63%> (-14.29%)	⬇️
src/InstallBundle/Listener/RequestListener.php	96.66% <100.00%> (ø)
src/InstallBundle/Listener/UpgradeListener.php	56.25% <100.00%> (ø)
... and 2 more

... and 1 file with indirect coverage changes

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