Python: Move framework tests out of experimental

Since they are not experimental anymore 😄

python/ql/test/library-tests/frameworks/stdlib/TestTaint.ql

@@ -0,0 +1,9 @@
+import experimental.dataflow.tainttracking.TestTaintLib
+import semmle.python.dataflow.new.RemoteFlowSources
+
+class WithRemoteFlowSources extends TestTaintTrackingConfiguration {
+  override predicate isSource(DataFlow::Node source) {
+    super.isSource(source) or
+    source instanceof RemoteFlowSource
+  }
+}