[Tests] Add tests on smartcasts on static Java fields

Current behavior for different modules is undesired, will be fixed in
the next commit

^KT-58279

compiler/testData/diagnostics/tests/smartCasts/variables/staticJavaFieldFromSameModule.kt

@@ -0,0 +1,28 @@
+// SKIP_TXT
+
+// FILE: J.java
+public class J {
+    public static final Object staticFinalJava = "";
+    public static Object staticNonFinalJava = "";
+}
+
+// FILE: Test.kt
+fun isCast() {
+    if (J.staticFinalJava is String) {
+        <!DEBUG_INFO_SMARTCAST!>J.staticFinalJava<!>.length
+        (J.staticFinalJava <!USELESS_CAST!>as String<!>).length
+    }
+
+    if (J.staticNonFinalJava is String) {
+        <!SMARTCAST_IMPOSSIBLE!>J.staticNonFinalJava<!>.length
+        (J.staticFinalJava as String).length
+    }
+}
+
+fun asCast() {
+    J.staticFinalJava as String
+    <!DEBUG_INFO_SMARTCAST!>J.staticFinalJava<!>.length
+
+    J.staticNonFinalJava as String
+    <!SMARTCAST_IMPOSSIBLE!>J.staticNonFinalJava<!>.length
+}