Remove unused test data on JS metadata version

Apparently these tests are no longer being run after a6d461dbe8.

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJs/library/a.kt

@@ -1,11 +0,0 @@
-package a
-
-open class A {
-    class Nested
-
-    fun method() {}
-}
-
-fun foo() {}
-var bar = 42
-typealias TA = String

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJs/output.txt

@@ -1,2 +0,0 @@
-error: file '$TMP_DIR$/library.meta.js' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 42.0.0, expected version is $ABI_VERSION$
-COMPILATION_ERROR

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJs/source.kt

@@ -1,15 +0,0 @@
-package usage
-
-import a.*
-
-fun baz(param: A, nested: A.Nested) {
-    val constructor = A()
-    val nested = A.Nested()
-    val methodCall = param.method()
-    val supertype = object : A() {}
-
-    val x = foo()
-    val y = bar
-    bar = 239
-    val z: TA = ""
-}

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJsSkipVersionCheck/library/a.kt

@@ -1,11 +0,0 @@
-package a
-
-open class A {
-    class Nested
-
-    fun method() {}
-}
-
-fun foo() {}
-var bar = 42
-typealias TA = String

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJsSkipVersionCheck/output.txt

@@ -1 +0,0 @@
-OK

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJsSkipVersionCheck/source.kt

@@ -1,16 +0,0 @@
-@file:Suppress("UNUSED_VARIABLE", "UNUSED_PARAMETER")
-package usage
-
-import a.*
-
-fun baz(param: A, nested: A.Nested) {
-    val constructor = A()
-    val nested2 = A.Nested()
-    val methodCall = param.method()
-    val supertype = object : A() {}
-
-    val x = foo()
-    val y = bar
-    bar = 239
-    val z: TA = ""
-}