Remove duplicate Quarkus outputs in the "Tasks" dropdown

[xorye]

This extension creates two outputs, one called "Quarkus Extension" and another called "Quarkus Tools".

Output related to the Quarkus language server can be read in "Quarkus Tools".
Errors from the "Add extensions to current project" command is displayed in "Quarkus Extensions"

At first glance, it is confusing to understand which output does what. Maybe the output's names should be more self-describing, or maybe there should be only one output.