Equalize Activity Events

[Braindea7]

Insert class and index to ActivityCompleted and ActivityFailed Events as it is in ActivityStarted.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4148e90) to head (ea53fa5).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #337   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       564       564           
===========================================
  Files             61        61           
  Lines           1940      1948    +8     
===========================================
+ Hits            1940      1948    +8     

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