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_enum_pkg_qual/case.ww

@@ -0,0 +1,7 @@
+//ww:run-exit 1
+// Migrated from 700_e2e row 118.
+package pkg;
+type dir = enum { NORTH, SOUTH, EAST, WEST };
+package main;
+import pkg;
+fn main() i32 = { return pkg.dir.SOUTH as i32; };