[opentelemetry-php-contrib] [opentelemetry-auto-symfony] http.route uses route name instead of route template path

Describe your environment

• PHP version: 8.4
• open-telemetry/opentelemetry-auto-symfony: ^1.1.1
• Symfony: 8
• OS: Linux

Steps to reproduce

1. Create a Symfony application with a route that has path parameters:

<?php
#[Route('/v1/payments/{paymentId}/capture', name: 'api_payments_capture', methods: ['POST'])]
public function capture(string $paymentId): Response
{
    return new JsonResponse(['id' => $paymentId]);
}

2. Make a request to POST /v1/payments/abc123/capture
3. Inspect the generated span in your tracing backend (Jaeger, etc.) in http.route will be "api_payments_capture"

What is the expected behavior?
Per OpenTelemetry HTTP semantic conventions, http.route should be "the matched route template for the request. This MUST be low-cardinality and include all static path segments, with dynamic path segments represented with placeholders"

• http.route: /v1/payments/{paymentId}/capture

What is the actual behavior?
The instrumentation uses the Symfony route name from $request->attributes->get('_route'):

• http.route: api_payments_capture

Additional context
Current workaround is to use an event subscriber that modifies _route before the instrumentation reads it, but this is fragile and could affect other application logic that depends on the route name.

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Start in the Symfony instrumentation at the point where http.route is read from $request->attributes->get('_route'). Reproduce the POST request from the issue and compare the emitted span with the OpenTelemetry HTTP semantic conventions; done means http.route contains /v1/payments/{paymentId}/capture rather than api_payments_capture.