fix: remove duplicate success emoji in validate command output

The success() method automatically adds a checkmark emoji via the theme,
so we shouldn't include it in the message text. This caused a duplicate
'✅ ✅' to appear in the validate command success message.

Output before: ✅ ✅ Configuration file 'x.json' is valid
Output after:  ✅ Configuration file 'x.json' is valid

Author: josecelano

src/presentation/controllers/validate/handler.rs

@@ -161,7 +161,7 @@ impl ValidateCommandController {
     ) -> Result<(), ValidateSubcommandError> {
         self.progress.blank_line()?;
         self.progress.complete(&format!(
-            "✅ Configuration file '{}' is valid\n\n\
+            "Configuration file '{}' is valid\n\n\
             Environment Details:\n\
               • Name: {}\n\
               • Provider: {}\n\