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/sourceMapRelativeRoot.args

@@ -1,5 +1,6 @@
 $TESTDATA_DIR$/sourceMapRelativeRoot/lib/src/lib.kt
 -Xlegacy-deprecated-no-warn
+-Xuse-deprecated-legacy-compiler
 -source-map
 -meta-info
 -output
@@ -7,6 +8,7 @@ $TESTDATA_DIR$/sourceMapRelativeRoot/lib/out/lib.js
 ---
 $TESTDATA_DIR$/sourceMapRelativeRoot/main/src/main.kt
 -Xlegacy-deprecated-no-warn
+-Xuse-deprecated-legacy-compiler
 -libraries
 $TESTDATA_DIR$/sourceMapRelativeRoot/lib/out/
 -source-map