fix: routes registration bug

[kenjis]

Description
If there are two routes having the same from but with the different name,
the first route is not registered correctly.

• fix RouteCollection
• fix incorrect tests

How to Reproduce the Bug

$routes->get('/', static fn () => 'Hello World!', ['as' => 'RouteName']);
$routes->get('/', 'Home::index');

Before:

+--------+--------+------------------------------------------+----------------+---------------+
| Method | Route  | Handler                                  | Before Filters | After Filters |
+--------+--------+------------------------------------------+----------------+---------------+
| GET    | /      | \App\Controllers\Home::index             |                | toolbar       |
| CLI    | ci(.*) | \CodeIgniter\CLI\CommandRunner::index/$1 |                |               |
+--------+--------+------------------------------------------+----------------+---------------+

After:

+--------+--------+------------------------------------------+----------------+---------------+
| Method | Route  | Handler                                  | Before Filters | After Filters |
+--------+--------+------------------------------------------+----------------+---------------+
| GET    | /      | (Closure)                                |                | toolbar       |
| CLI    | ci(.*) | \CodeIgniter\CLI\CommandRunner::index/$1 |                |               |
+--------+--------+------------------------------------------+----------------+---------------+

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

I'll have to come back to this one