Remove reference to testingapplication feature

Author: gab1one

org.knime.knip.testing.feature/feature.xml

@@ -728,7 +728,6 @@ propagated with or for interoperation with KNIME.
    </license>
 
    <requires>
-      <import feature="org.knime.features.testingapplication" version="2.7.0" match="greaterOrEqual"/>
       <import plugin="org.knime.core.streaming"/>
       <import plugin="org.knime.base.filehandling"/>
    </requires>