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/script_context/v2/ctx/withdrawals/tx.diag.template

@@ -0,0 +1,42 @@
+[
+    { 0:
+      [ [h'0000000000000000000000000000000000000000000000000000000000000000', 0]
+      ]
+
+    , 1:
+      [ [h'6011111111111111111111111111111111111111111111111111111111', 1000000000]
+      ]
+
+    , 2: 42
+
+    , 5:
+      { h'e022222222222222222222222222222222222222222222222222222222': 42
+      , h'f0afddc16c18e7d8de379fb9aad39b3d1b5afd27603e5ebac818432a72': 14
+      }
+
+    , 11: h'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF'
+
+    , 13:
+      [ [h'0000000000000000000000000000000000000000000000000000000000000000', 0]
+      ]
+
+    , 16:
+      [ h'6000000000000000000000000000000000000000000000000000000000', 1000000000
+      ]
+
+    , 17: 1
+    },
+
+    { 5:
+      [ [0, 0, 121([]), [1000000, 100000000]]
+      , [3, 1, 121([]), [1000000, 100000000]]
+      ]
+
+    , 6: [ {{ VALIDATOR }}, h'583b010000323232323232322253330054a22930b180080091129998030010a4c26600a6002600e0046660060066010004002ae695cdaab9f5742ae881' ]
+
+    },
+
+    true,
+
+    null
+]