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/cli/js/sourceMapRootMissing.args

@@ -3,6 +3,7 @@ $TESTDATA_DIR$/sourceMapRoot/bar/file2.kt
 $TESTDATA_DIR$/sourceMapRoot/bar/baz/file3.kt
 $TESTDATA_DIR$/sourceMapRoot/foo/baz/file4.kt
 -Xlegacy-deprecated-no-warn
+-Xuse-deprecated-legacy-compiler
 -source-map
 -source-map-base-dirs
 $TESTDATA_DIR$/sourceMapRoot/foo