Duplicate views in `AVAILABLE VIEWS` view for experiments with traces of the same type

[bhufmann]

Bug Description:

The AVAILABLE VIEWS view shows duplicate views created by XML analysis (using Trace Compass trace server) when the experiment contains multiple traces of the same trace type. For example, the picture below shows 3 Futex Content Analysis : Scenario or Futex Content Analysis : Uaddr vs Waiter for an experiment with 3 kernel traces. Note that the futex analysis is built-in in the Trace Compass server and no XML description has to be loaded to reproduce this.

Steps to Reproduce:

1. Create experiment with 2 or more LTTng kernel traces
2. Open Experiment
3. Observe that AVAILABLE VIEWS view has duplicate views

Additional Information

• Operating System: All
• Theia Version: 1.61
• Version; 0.8.0

[bhufmann]

Fixed with xml: Don't return duplicate data provider descriptors from xml manager eclipse-tracecompass/org.eclipse.tracecompass#293