Move script context e2e tests under a nested 'v2' directory.

And rework scripts to run them in anticipation of new v3 contexts.

examples/acceptance_tests/run-all-examples

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+find . -regex ".*[0-9]\{3\}" -type d | xargs -P 8 -I {} -- ./run {}