Build incremental testing utils to kotlin-build-common-test.jar

KT-8487

build-common/build-common.iml

@@ -4,6 +4,7 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
@@ -14,4 +15,4 @@
     <orderEntry type="module" module-name="compiler-tests" scope="TEST" />
     <orderEntry type="library" scope="TEST" name="idea-full" level="project" />
   </component>
-</module>
+</module>