[IDEA-TESTS] Specify language version in feature-dependent tests

Some quickfixes are relying on diagnostics, that won't be reported
with new language features enabled.
`MixedNamedArgumentsInTheirOwnPosition`
`AllowBreakAndContinueInsideWhen`

idea/testData/quickfix/when/breakInWhenInLabeled.kt

@@ -1,5 +1,6 @@
 // "Add '@loop' to break" "true"
 // WITH_RUNTIME
+// LANGUAGE_VERSION: 1.3
 
 fun foo(chars: CharArray) {
     val length = chars.size