test: migrate 700_e2e rows to corpus fixtures; retire the carrier

136 rows migrated, 0 already owned, 3 wwstage-failing rows held out.

test/wcc/data/r700_tuple_range_destr/case.ww

@@ -0,0 +1,13 @@
+//ww:run-exit 33
+// Migrated from 700_e2e row 43.
+package main;
+fn main() i32 = {
+  let buf: [4]i64;
+  buf[0] = 1; buf[1] = 10; buf[2] = 2; buf[3] = 20;
+  let s: [](i64, i64);
+  s.ptr = buf.ptr: *(i64, i64);
+  s.len = 2; s.cap = 2;
+  let total: i64 = 0;
+  for (let (k, v) .. s) { total += k + v; };
+  return total: i32;
+};