K2 scripting: treat default import similarly to K1

namely, add them to importing scopes directly and according to the
schema used for other implicit imports, rather than adding them
to the regular script file imports. See KT-65982 for explanation.
#KT-65982 fixed

plugins/scripting/scripting-tests/testData/diagnostics/testScripts/conflictingImportsWithJava.test.kts

@@ -0,0 +1,15 @@
+// SCRIPT_DEFAULT_IMPORTS: b.A
+
+// MODULE: a
+// FILE: a.java
+package a;
+public class A {
+    public static void s() { return; }
+}
+// FILE: aa.java
+package b;
+public interface A {}
+//MODULE: b(a)
+// FILE: b.test.kts
+import a.A
+val b = A.s()