Make `BasePath::new_temp_dir` return the same path for the program lifetime (#12246)

* Make `BasePath::new_temp_dir` return the same path for the program lifetime

Instead of returning always a different path, this now returns the same path for the entire lifetime
of the program. We still ensure that the path is cleared at the end of the program.

* Update client/service/src/config.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Update client/service/src/config.rs

Co-authored-by: Nitwit <47109040+nitwit69@users.noreply.github.com>

* FMT

Co-authored-by: Koute <koute@users.noreply.github.com>
Co-authored-by: Nitwit <47109040+nitwit69@users.noreply.github.com>