Refactors (#15117)

* refactor(tauri-build): make better use of OsString

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

* refactor(tauri-build): dont wrap const value in function

* refactor(tauri-build): None codepath is never used, replace Option<Vec> with Vec

* refactor(tauri): use blocking apis where it makes sense

* refactor(tauri): better use of std::fs API

* refactor(tauri): rewind to start

* refactor(tauri): fmt

* add change file