Rollup merge of #122680 - lqd:nested-await-args, r=compiler-errors

Do not eat nested expressions' results in `MayContainYieldPoint` format args visitor

#121563 unintentionally changed the `MayContainYieldPoint` format args visitor behavior, now missing yield points in nested expressions, as seen in #122674.

The walk can find a yield point in an expression but it was ignored.

r? ``@petrochenkov`` as the reviewer of #121563
cc ``@Jarcho`` as the author

Fixes #122674.
We're in the 1.77 release week. #121563 will land on 1.78 but beta is still 1.77.9: this PR will likely need to be backported soon after beta is cut.

Author: matthiaskrgr