chore: Remove the sentry and agafua-syslog runtime dependencies.

[bgrozev]

This is to stop shipping non-essential jars and reduce potential exposure to vulnerabilities. Setting up sentry requires setting an environment variable (and potentially more changes?), so it should be easy to adapt to also include the sentry jar in the classpath.

cc @saghul @sapkra

[codecov]

Codecov Report

Merging #392 (e9c956e) into master (a2399b9) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #392      +/-   ##
============================================
+ Coverage     23.32%   23.34%   +0.01%     
+ Complexity      291      290       -1     
============================================
  Files            62       62              
  Lines          5440     5440              
  Branches        742      742              
============================================
+ Hits           1269     1270       +1     
  Misses         3953     3953              
+ Partials        218      217       -1     

Impacted Files	Coverage Δ
...in/java/org/jitsi/jigasi/sounds/PlaybackQueue.java	54.38% <0.00%> (-1.76%)	⬇️
.../jitsi/jigasi/sounds/SoundNotificationManager.java	29.62% <0.00%> (-0.83%)	⬇️
src/main/java/org/jitsi/jigasi/JvbConference.java	45.33% <0.00%> (+0.29%)	⬆️
.../main/java/org/jitsi/jigasi/SipGatewaySession.java	50.00% <0.00%> (+0.44%)	⬆️

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