fix: send participation reply on fresh event

[SebastianKrupinski]

Summary

• modified parseEvent logic to send participation reply on both object creation (user saves event with participation status set) and object update (user changes participation status)
• added tests for new case

Reason

This resolves a condition where REPLY itip message are not generated when a user responses to a event using a client like TB with client side responses disableb

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.76%. Comparing base (6eee31d) to head (49d53f1).
⚠️ Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ITip/Broker.php	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #743   +/-   ##
=========================================
  Coverage     98.76%   98.76%           
- Complexity     1876     1882    +6     
=========================================
  Files            71       71           
  Lines          5345     5281   -64     
=========================================
- Hits           5279     5216   -63     
+ Misses           66       65    -1     

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