Move codegen tests on old language versions under oldLanguageVersions/

This directory is skipped in JVM IR test generator, so they won't show
up as failed anymore.

Note that only failing tests are moved to oldLanguageVersions/. Tests
which already pass are still being run. It may be useful not to break
them in case we _do_ need to support some pre-1.3 language feature
switches in JVM IR.

compiler/testData/codegen/box/functions/bigArity/noBigFunctionTypes.kt

@@ -1,22 +0,0 @@
-// !LANGUAGE: -FunctionTypesWithBigArity
-
-// This test does not make sense for JVM because a diagnostic is reported when function types with big arity are not available
-// (see diagnostics/tests/sourceCompatibility/noBigFunctionTypes.kt)
-// IGNORE_BACKEND: JVM, JVM_IR
-
-class A
-
-fun foo(
-    p00: A, p01: A, p02: A, p03: A, p04: A, p05: A, p06: A, p07: A, p08: A, p09: A,
-    p10: A, p11: A, p12: A, p13: A, p14: A, p15: A, p16: A, p17: A, p18: A, p19: A,
-    p20: A, p21: A, p22: A, p23: A, p24: A, p25: A, p26: A, p27: A, p28: A, p29: A
-): String = "OK"
-
-fun bar(x: Function30<A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, String>): String {
-    val a = A()
-    return x(a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a, a)
-}
-
-fun box(): String {
-    return bar(::foo)
-}