feat: add label 'state' to metric 'gitea_users' (#34326)

This PR adds the label _state_ to the metric _gitea_users_. With the
change, _gitea_users_ would be reported like this:

```
...
# HELP gitea_users Number of Users
# TYPE gitea_users gauge
gitea_users{state="active"} 20
gitea_users{state="inactive"} 10
...
```

The metrics above would be from a Gitea instance with 30 user accounts.
20 of the accounts are active and 10 of the accounts are not active.

Resolve #34325

models/user/user.go

@@ -828,6 +828,7 @@ func IsLastAdminUser(ctx context.Context, user *User) bool {
 type CountUserFilter struct {
 	LastLoginSince *int64
 	IsAdmin        optional.Option[bool]
+	IsActive       optional.Option[bool]
 }
 
 // CountUsers returns number of users.
@@ -848,6 +849,10 @@ func countUsers(ctx context.Context, opts *CountUserFilter) int64 {
 		if opts.IsAdmin.Has() {
 			cond = cond.And(builder.Eq{"is_admin": opts.IsAdmin.Value()})
 		}
+
+		if opts.IsActive.Has() {
+			cond = cond.And(builder.Eq{"is_active": opts.IsActive.Value()})
+		}
 	}
 
 	count, err := sess.Where(cond).Count(new(User))