Enable clippy::redundant_locals (#8750)

This PR enables the
[`clippy::redundant_locals`](https://rust-lang.github.io/rust-clippy/master/index.html#/redundant_locals)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/workspace/src/workspace.rs

@@ -871,7 +871,6 @@ impl Workspace {
 
                 cx.open_window(options, {
                     let app_state = app_state.clone();
-                    let workspace_id = workspace_id;
                     let project_handle = project_handle.clone();
                     move |cx| {
                         cx.new_view(|cx| {