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

libraries/examples/browser-example/pom.xml

@@ -65,6 +65,11 @@
                         <goals>
                             <goal>js</goal>
                         </goals>
+                        <configuration>
+                            <args>
+                                <arg>-Xuse-deprecated-legacy-compiler</arg>
+                            </args>
+                        </configuration>
                     </execution>
                     <execution>
                         <id>test-compile</id>