Add Exception::CallStack.empty
#15017
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This is a follow-up on #15002 which explicitly assigns a dummy callstack to
RetryLookupWithLiteralsfor performance reasons.CallStack.emptyis intended to make this use case a bit more ergonomical. It doesn't require allocating a dummy instance with fake data. Instead, it's an explicitly empty callstack. This makes this mechanism easier to re-use in other places (ref #11658 (comment)).