Rename test files to scripts to trigger proper scripting initialization

fix generation config accordingly

compiler/testData/diagnostics/tests/redeclarations/ScriptAndClassConflict.kts

@@ -0,0 +1,12 @@
+// FILE: f1.kt
+package test
+
+class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>A<!>
+class F1
+
+// FILE: A.kts
+package test
+
+val x = 1
+
+class F1