[Compiler CLI] Use reading language version settings from environment only if the resource is presented or flag is set

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -464,6 +464,10 @@ interface LanguageVersionSettings {
 
     // Please do not use this to enable/disable specific features/checks. Instead add a new LanguageFeature entry and call supportsFeature
     val languageVersion: LanguageVersion
+
+    companion object {
+        const val RESOURCE_NAME_TO_ALLOW_READING_FROM_ENVIRONMENT = "META-INF/allow-configuring-from-environment"
+    }
 }
 
 class LanguageVersionSettingsImpl @JvmOverloads constructor(