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/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -319,6 +319,12 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xwasm-enable-asserts", description = "Turn on asserts")
     var wasmEnableAsserts: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xuse-deprecated-legacy-compiler",
+        description = "Use deprecated legacy compiler without error"
+    )
+    var useDeprecatedLegacyCompiler: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xlegacy-deprecated-no-warn",
         description = "Disable warnings of deprecation of legacy compiler"