Replace MQTT library

[lmmhbt]

Summary

This PR replaces the Paho MQTT library with the HiveMQ MQTT library.

Issue

As mentioned in #6851 the Paho MQTT library should be replaced as decided in dev meeting.
Should be tested by HSL.

Unit tests

It is hard to test by unit tests and the change has to be tested by HSL anyway.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.10%. Comparing base (69dfcbe) to head (40fcc1e).
⚠️ Report is 56 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...rip/gtfs/updater/mqtt/MqttGtfsRealtimeUpdater.java	0.00%	51 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6906      +/-   ##
=============================================
- Coverage      72.10%   72.10%   -0.01%     
+ Complexity     19673    19671       -2     
=============================================
  Files           2125     2125              
  Lines          79533    79539       +6     
  Branches        8051     8051              
=============================================
- Hits           57350    57348       -2     
- Misses         19346    19354       +8     
  Partials        2837     2837              

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[jessicaKoehnke]

When the port issue is resolved, messages seem to be coming through. So in general this should work.

[jessicaKoehnke]

I tried this out with the example config. The port is missing in the configuration, which results in URI#getPort returning -1. That leads to this not working. You have to only set the port if it's not equal to -1

[lmmhbt]

Thanks, I added a check for the port.

[optionsome]

I tested this in our dev and seems to work as well as the previous library. I can approve this when #6906 (comment) is fixed.

[optionsome]

I'm not sure if we should or shouldn't generate a changelog entry from this pr.

[optionsome]

All the relevant parties already know about this change so for that reason alone, I decided that the changelog entry isn't needed.