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_tuple3_range_destr/case.ww

@@ -0,0 +1,13 @@
+//ww:run-exit 42
+// Migrated from 700_e2e row 47.
+package main;
+fn main() i32 = {
+  let buf: [3]i64;
+  buf[0] = 5; buf[1] = 7; buf[2] = 30;
+  let s: [](i64, i64, i64);
+  s.ptr = buf.ptr: *(i64, i64, i64);
+  s.len = 1; s.cap = 1;
+  let total: i64 = 0;
+  for (let (a, b, c) .. s) { total += a + b + c; };
+  return total: i32;
+};