Rollup merge of #136071 - wowinter13:clippy-add-diagnostic-items, r=flip1995

[Clippy] Add vec_reserve & vecdeque_reserve diagnostic items

I’m currently working on reviving this lint (rust-lang/rust-clippy#10157), and there was [a comment](rust-lang/rust-clippy#10157 (comment)) from ``@flip1995`` regarding the necessity of adding new diagnostic items.

Author: matthiaskrgr