fix: log unknown usernames too for failed attempts (#19199)

[skip ci]

frappe/auth.py

@@ -230,10 +230,11 @@ class LoginManager:
 		if not (user and pwd):
 			self.fail(_("Incomplete login details"), user=user)
 
+		_raw_user_name = user
 		user = User.find_by_credentials(user, pwd)
 
 		if not user:
-			self.fail("Invalid login credentials")
+			self.fail("Invalid login credentials", user=_raw_user_name)
 
 		# Current login flow uses cached credentials for authentication while checking OTP.
 		# Incase of OTP check, tracker for auth needs to be disabled(If not, it can remove tracker history as it is going to succeed anyway)