Modify stringify so it ignores `[Citation]` inside `Cite`.

Otherwise we'll sometimes get two copies of things, one
from the `citationPrefix` or `citationSuffix` and another
from the embedded fallback text.

When there is no fallback text, we'll get no content.
However, it really isn't an alternative to just rely
on the result of running `query` on the embedded `Citation`s;
this will result in a jumble of text rather than anything
structured.

Closes #7855.

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