JS: support -Xskip-metadata-version-check for incompatible ABI libraries

Allow the compiler to read such libraries without any errors, at the
risk of crashing with an exception.

Also fix a minor bug in the diagnostic message in LibrarySourcesConfig
and in the corresponding test in KotlinJpsBuildTest

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

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

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJsSkipVersionCheck/output.txt

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

compiler/testData/compileKotlinAgainstCustomBinaries/wrongMetadataVersionJsSkipVersionCheck/source.kt

@@ -0,0 +1,16 @@
+@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 = ""
+}