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/tests/org/jetbrains/kotlin/cli/LauncherScriptTest.kt

@@ -141,7 +141,7 @@ class LauncherScriptTest : TestCaseWithTmpdir() {
         runProcess(
             "kotlinc-js",
             "$testDataDirectory/emptyMain.kt",
-            "-Xlegacy-deprecated-no-warn", "-output", File(tmpdir, "out.js").path
+            "-Xlegacy-deprecated-no-warn", "-Xuse-deprecated-legacy-compiler", "-output", File(tmpdir, "out.js").path
         )
     }