Change policy with legacy compiler backend

[JS] Remove incremental js jps test

[JS] Remove test of maven js archetype

[JS] Fix another one test

[JS] Fix tests for jps

[JS] Try to fix maven test data

[JS] Fix test data

[JS] Fix test data for ant

[JS] Fix jsExtraHelp test

[JS] Fix test run from not-Gradle build tools

[JS] Set flag without compiler error

[JS] Disable warnings and errors in legacy compiler called from Gradle

[JS] Proofread messages

[JS] Not proofread messages

KT-42326

compiler/testData/integration/ant/js/sourceMap/build.xml

@@ -2,6 +2,8 @@
   <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
 
   <target name="build">
-    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" sourcemap="true"/>
+    <kotlin2js src="${test.data}/root1" output="${temp}/out.js" sourcemap="true">
+      <compilerarg value="-Xuse-deprecated-legacy-compiler"/>
+    </kotlin2js>
   </target>
 </project>