update format date when using %x %X %r (#10272)

# Description

Apparently some strftime formats are already localized and when you
"double localize" them, they don't work. This PR fixes that so that %x
%X %r %c don't go through the localization step.

Example: %x %X
### Before
```nushell
❯ date now | format date "%x %X %p"
09/08/2023 08 AM
```
### After
```nushell
❯ date now | format date "%x %X %p"
09/08/23 08:09:14 AM
```

I started to make one format_datetime to rule them all but one returns a
string and one returns a value. If we convert to the string, we lose the
nice error messages. If we change to value, more code has to be changed
elsewhere. So, I decided to just leave two functions.

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crates/nu-command/src/strings/format/date.rs

@@ -117,13 +117,21 @@ where
     Tz::Offset: Display,
 {
     let mut formatter_buf = String::new();
+    // These are already in locale format, so we don't need to localize them
+    let format = if ["%x", "%X", "%r"]
+        .iter()
+        .any(|item| formatter.contains(item))
+    {
+        date_time.format(formatter)
+    } else {
         let locale: Locale = get_system_locale_string()
             .map(|l| l.replace('-', "_")) // `chrono::Locale` needs something like `xx_xx`, rather than `xx-xx`
             .unwrap_or_else(|| String::from("en_US"))
             .as_str()
             .try_into()
             .unwrap_or(Locale::en_US);
-    let format = date_time.format_localized(formatter, locale);
+        date_time.format_localized(formatter, locale)
+    };
 
     match formatter_buf.write_fmt(format_args!("{format}")) {
         Ok(_) => Value::string(formatter_buf, span),

crates/nu-protocol/src/value/mod.rs

@@ -802,13 +802,21 @@ impl Value {
         Tz::Offset: Display,
     {
         let mut formatter_buf = String::new();
+        // These are already in locale format, so we don't need to localize them
+        let format = if ["%x", "%X", "%r"]
+            .iter()
+            .any(|item| formatter.contains(item))
+        {
+            date_time.format(formatter)
+        } else {
             let locale: Locale = get_system_locale_string()
                 .map(|l| l.replace('-', "_")) // `chrono::Locale` needs something like `xx_xx`, rather than `xx-xx`
                 .unwrap_or_else(|| String::from("en_US"))
                 .as_str()
                 .try_into()
                 .unwrap_or(Locale::en_US);
-        let format = date_time.format_localized(formatter, locale);
+            date_time.format_localized(formatter, locale)
+        };
 
         match formatter_buf.write_fmt(format_args!("{format}")) {
             Ok(_) => (),