[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.

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