Remove LANGUAGE_VERSION from non-coroutine codegen tests

Most of these tests used this directive as a way to opt in to a new
language feature, and most of those features are already stable for a
long time, so no opt-in is needed. Some other tests used the directive
to opt out from a language feature, replace those by the `LANGUAGE`
directive. One test used the directive to test behavior that actually
depended on the API version; use `API_VERSION` directive there instead.

compiler/testData/compileKotlinAgainstKotlin/jvmPackageName.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: NATIVE
 // FILE: A.kt
-// LANGUAGE_VERSION: 1.2
 
 @file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 @file:JvmPackageName("bar")
@@ -13,7 +12,6 @@ var v: Int = 1
 inline fun i(block: () -> Unit) = block()
 
 // FILE: B.kt
-// LANGUAGE_VERSION: 1.2
 
 import foo.*
 

compiler/testData/compileKotlinAgainstKotlin/jvmPackageNameInRootPackage.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: NATIVE
 // FILE: A.kt
-// LANGUAGE_VERSION: 1.2
 
 @file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 @file:JvmPackageName("bar")
@@ -10,7 +9,6 @@ fun f() = "OK"
 var v: Int = 1
 
 // FILE: B.kt
-// LANGUAGE_VERSION: 1.2
 
 fun box(): String {
     v = 2

compiler/testData/compileKotlinAgainstKotlin/jvmPackageNameWithJvmName.kt

@@ -1,6 +1,5 @@
 // IGNORE_BACKEND: NATIVE
 // FILE: A.kt
-// LANGUAGE_VERSION: 1.2
 
 @file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 @file:JvmPackageName("bar")
@@ -12,7 +11,6 @@ fun f() = "OK"
 var v: Int = 1
 
 // FILE: B.kt
-// LANGUAGE_VERSION: 1.2
 
 import foo.*