Auto merge of #54533 - ljedrz:cleanup_librustc_typeck_check, r=davidtwco

A few cleanups and minor improvements to typeck/check

- turn a `loop` into a `while let`
- turn a `push_back` loop into an `extend`
- turn a few `push` loops into collected iterators
- prefer `vec![x; n]` to `(0..n).map(|_| x).collect()`
- combine two loops doing the same thing on 2 data sets using `chain`
- use `unwrap_or` where applicable and readable
- add a `potentially_plural_count` helper function to simplify several `format!()` calls
- prefer `to_owned` to `to_string` for string literals
- change `match` to `if let` where only one branch matters
- a few other minor improvements
- whitespace fixes

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