K2 Scripting tests: adding tests on script decls visibility

fixes (makes it stable) behavior of the script top-level declarations
visibility in K2 scripts

compiler/fir/analysis-tests/testData/resolve/scripts/scriptsDeclsMayConflict.fir.txt

@@ -0,0 +1,20 @@
+FILE: script1.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: <script-script1.kts>
+        lval args: R|kotlin/Array<kotlin/String>|
+
+        public final val a: R|kotlin/Int| = Int(42)
+            public get(): R|kotlin/Int|
+
+FILE: script2.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: <script-script2.kts>
+        lval args: R|kotlin/Array<kotlin/String>|
+
+        public final val a: R|kotlin/String| = String(42)
+            public get(): R|kotlin/String|
+
+FILE: main.kt
+    public final fun foo(): <ERROR TYPE REF: Ambiguity: a, [/a, /a]> {
+        ^foo <Ambiguity: a, [/a, /a]>#
+    }