refactor: rewrite some `&String` to `&str` (#14857)

* perf(tauri-build): refactor find_icon to use &str to remove unnecessary clones

* refactor(perf-tauri-build): remove obsolete changelog for find_icon refactor

* refactor(tauri-build): inline find_icon logic to simplify window icon path retrieval

* refactor(context): update find_icon predicate to use &str

* refactor(context): simplify predicate in find_icon to accept &&String

* Update crates/tauri-build/src/lib.rs

Co-authored-by: Tony <68118705+Legend-Master@users.noreply.github.com>

---------

Co-authored-by: Tony <68118705+Legend-Master@users.noreply.github.com>