[EH] Rename -eh lit test names to -eh-old (#6227)

This renames all existing EH lit tests with filenames `*eh*` to
`*eh-old*`. This is a prep work so that we can add tests for the new EH
spec using `*eh*`. The reason I'm trying to split old and new EH test
files is we don't support fuzzing for the new EH yet and I wouldn't want
to exclude old EH tests from fuzzing too because of that.

Author: aheejin

test/lit/binary/stacky-eh.test renamed to test/lit/binary/stacky-eh-old.test

@@ -1,6 +1,6 @@
 ;; Verify stacky EH binary can be parsed correctly.
 ;;
-;; stacky-eh.test.wasm contains below:
+;; stacky-eh-old.test.wasm contains below:
 ;; try
 ;;   nop
 ;; catch 0 # tag type i32