[11.x] use exists() instead of count() #53328
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we only need to check for existence of a record here, not for the actual count, and `exists()` is generally more performant than a count.
- add an "exists" assertions, and update `mockCountBuilder()` to accept this first, and adjust all the calls to it. - I thought about renaming `mockCountBuilder()` to `mockBuilder()`, which would probably be a little clearer now, but I wanted to keep this easy to review. if this is accepted, I'd probably go back and make that semantic change separately.
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we only need to check for existence of a record here, not for the actual count, and
exists()is generally more performant than a count.