After commit 9b5b0447, declaration of Groovy-based inspections moved
into gradle-groovy.xml. However, this makes transitive-optional
dependency between plugin.xml, gradle-java.xml & gradle-groovy.xml
which doesn't work (see IDEA-209769) and inspections aren't loaded.
This commit breaks this transitivity by declaring dependency
to gradle-groovy.xml directly in plugin.xml.
This also fixes most tests from GradleInspectionTest group.
Since 183 changes in .gradle.kts files are tracked correctly by platform and notification 'Gradle project needs to be imported' is shown when those files are modified
Mikhail Glukhikh