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Add `manual_empty_string_creations` lint Closes #2972 - [x] Followed [lint naming conventions][lint_naming] - [x] Added passing UI tests (including committed `.stderr` file) - [x] `cargo test` passes locally - [x] Executed `cargo dev update_lints` - [x] Added lint documentation - [x] Run `cargo dev fmt` changelog: [`manual_empty_string_creations`]: Add lint for empty String not being created with `String::new()`