Enable clippy::needless_question_mark (#8759)

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

Release Notes:

- N/A

crates/collab/src/api.rs

@@ -179,14 +179,13 @@ async fn add_contributor(
     Json(params): Json<AuthenticatedUserParams>,
     Extension(app): Extension<Arc<AppState>>,
 ) -> Result<()> {
-    Ok(app
-        .db
+    app.db
         .add_contributor(
             &params.github_login,
             params.github_user_id,
             params.github_email.as_deref(),
         )
-        .await?)
+        .await
 }
 
 #[derive(Deserialize)]