mv: make 'UpdateMode' public for nushell

[dmatos2012]

Related to the work done on making some mv api public in pull #5335, there was UpdateMode missing from that as its still private and therefore cannot build Options {} for nushell.

The fix :

diff --git a/src/uu/mv/src/mv.rs b/src/uu/mv/src/mv.rs
index 9888389ae..02c856ce0 100644
--- a/src/uu/mv/src/mv.rs
+++ b/src/uu/mv/src/mv.rs
@@ -19,12 +19,12 @@ use std::os::unix;
 #[cfg(windows)]
 use std::os::windows;
 use std::path::{Path, PathBuf};
-pub use uucore::backup_control::BackupMode;
 use uucore::backup_control::{self, source_is_target_backup};
 use uucore::display::Quotable;
 use uucore::error::{set_exit_code, FromIo, UError, UResult, USimpleError, UUsageError};
 use uucore::fs::{are_hardlinks_or_one_way_symlink_to_same_file, are_hardlinks_to_same_file};
-use uucore::update_control::{self, UpdateMode};
+use uucore::update_control;
+pub use uucore::{backup_control::BackupMode, update_control::UpdateMode};
 use uucore::{format_usage, help_about, help_section, help_usage, prompt_yes, show};
 
 use fs_extra::dir::{

Right now I use that diff and it seems to work just fine from nushell, so the fix should be just fine I think :)

I could also make a PR with these tiny changes if its ok so that nushell can use them

[cakebaker]

Yes, make a PR, please