manual_div_ceil: Added check for variant x.next_multiple_of(y) / y

[mnemonikr]

Suggest using x.div_ceil(y) instead of x.next_multiple_of(y) / y.

fixes #16219

changelog: [manual_div_ceil]: Added check for variant x.next_multiple_of(y) / y

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[mnemonikr]

While this catches x.next_multiple_of(y) / y, it currently doesn't catch the same call if formatted as u32::next_multiple_of(x, y) / y. Happy to accept pointers on what changes I'd need to make to cover this edge case as well.

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[mnemonikr]

@rustbot ready