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/deploy/tx.diag.template

@@ -0,0 +1,33 @@
+[
+    { 0:
+      [ [h'0000000000000000000000000000000000000000000000000000000000000000', 0]
+      ]
+
+    , 1:
+      [ { 0: h'6000000000000000000000000000000000000000000000000000000000'
+        , 1: 1000000
+        , 2: [ 0, h'fcaa61fb85676101d9e3398a484674e71c45c3fd41b492682f3b0054f4cf3273' ]
+        , 3: 24(h'8202583D583B0100003232323232323222253330064A22930B180080091129998030010A4C26600A6002600E0046660060066010004002AE695CDAAB9F5742AE89')
+        }
+
+      , { 0: h'100000000000000000000000000000000000000000000000000000000066666666666666666666666666666666666666666666666666666666'
+        , 1: 1000000
+        , 2: [ 1, 24(h'D8799F182AFF') ]
+        }
+      ]
+
+    , 2: 1
+    },
+
+    { 4: [121([]), 121([42])]
+
+    , 5: [[0, 0, 121([]), [1000000, 100000000]]]
+
+    , 6: [h'{{ VALIDATOR }}']
+
+    },
+
+    true,
+
+    null
+]