Remove unneeded 'static lifetimes on &strs in constants (#8698)

This PR removes unneeded `'static` lifetimes on `&str`s stored in
`const` declarations.

This addresses some Clippy lints about
[`redundant_static_lifetimes`](https://rust-lang.github.io/rust-clippy/master/index.html#/redundant_static_lifetimes).

In item-level `const` declarations we can rely on lifetime elision and
use the default `'static` lifetime.

Note that associated constants still require an explicit `'static`
lifetime, as explained in
https://github.com/rust-lang/rust/issues/115010.

Release Notes:

- N/A

crates/collab/src/db.rs

@@ -375,7 +375,7 @@ impl Database {
 }
 
 fn is_serialization_error(error: &Error) -> bool {
-    const SERIALIZATION_FAILURE_CODE: &'static str = "40001";
+    const SERIALIZATION_FAILURE_CODE: &str = "40001";
     match error {
         Error::Database(
             DbErr::Exec(sea_orm::RuntimeErr::SqlxError(error))