[Build] Remove dist_root artifact from JPS project configuration

This artifact was used to build compiler artifact during each project
  build, which is not needed for running compiler tests. Removal of
  this artifact from build chain reduces time of build for ~3 seconds
  which is a lot for rebuilds after minor changes (which are usually
  take only few seconds)

.idea/artifacts/dist_root.xml

@@ -1,8 +0,0 @@
-<component name="ArtifactManager">
-  <artifact build-on-make="true" name="dist_root">
-    <output-path>$PROJECT_DIR$/dist</output-path>
-    <root id="root">
-      <element id="artifact" artifact-name="dist" />
-    </root>
-  </artifact>
-</component>