[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/checkArguments/addNameToArgument/invokeOnString.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = 42'" "true"
+// LANGUAGE_VERSION: 1.3
+
 operator fun String.invoke(a: Int, b: Int) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/invokeOnString.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = 42'" "true"
+// LANGUAGE_VERSION: 1.3
+
 operator fun String.invoke(a: Int, b: Int) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArguments.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: Int, b: String) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArguments.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: Int, b: String) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsConstructor.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 class A(a: Int, b: String) {}
 
 fun f() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsConstructor.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 class A(a: Int, b: String) {}
 
 fun f() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsMultiple.kt

@@ -1,4 +1,6 @@
 // "Add name to argument..." "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: Int, b: String = "b", c: String = "c") {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsMultiple.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument..." "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: Int, b: String = "b", c: String = "c") {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsSubtype.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = B()'" "true"
+// LANGUAGE_VERSION: 1.3
+
 open class A {}
 open class B : A() {}
 

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsSubtype.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = B()'" "true"
+// LANGUAGE_VERSION: 1.3
+
 open class A {}
 open class B : A() {}
 

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsUsedNamed.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: String, b: String) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsUsedNamed.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: String, b: String) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsUsedPositional.kt

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: String, x: Int, b: String) {}
 
 fun g() {

idea/testData/quickfix/checkArguments/addNameToArgument/mixedNamedAndPositionalArgumentsUsedPositional.kt.after

@@ -1,4 +1,6 @@
 // "Add name to argument: 'b = "FOO"'" "true"
+// LANGUAGE_VERSION: 1.3
+
 fun f(a: String, x: Int, b: String) {}
 
 fun g() {