Change Gradio rfs test to use shared rfs test module

Author: sylwia-budzynska

python/ql/test/library-tests/frameworks/gradio/source_test.ql

@@ -1,20 +1,2 @@
 import python
-import semmle.python.dataflow.new.RemoteFlowSources
-import TestUtilities.InlineExpectationsTest
-private import semmle.python.dataflow.new.internal.PrintNode
-
-module SourceTest implements TestSig {
-  string getARelevantTag() { result = "source" }
-
-  predicate hasActualResult(Location location, string element, string tag, string value) {
-    exists(location.getFile().getRelativePath()) and
-    exists(RemoteFlowSource rfs |
-      location = rfs.getLocation() and
-      element = rfs.toString() and
-      value = prettyNode(rfs) and
-      tag = "source"
-    )
-  }
-}
-
-import MakeTest<SourceTest>
+import experimental.meta.RemoteFlowSourceTest