fix(framework): Prevent registering express handler for disabled routes (#14236)
## Summary
**What** — What changes are introduced in this PR?
Avoid registering express handlers for routes that have been disabled via `defineFileConfig`.
**Why** — Why are these changes relevant or necessary?
When middlewares are defined, disabled routes satisfying the matcher will be registered in express routes with no handler (since this is correctly skipped). This will cause, for example, for routes that have `validateAndTransformBody` defined, for the middleware to be registered. When the body doesn't match the validator, instead of the expected 404, we would get a 400, since the route is registered in the express application (even though it doesn't have a corresponding handler).
**How** — How have these changes been implemented?
Added a new `#isRouteFileDisabled` method to `ApiLoader` that prevents a middleware to be registered in the express application if the route was disabled.
**Testing** — How have these changes been tested, or how can the reviewer test the feature?
Integration tests.
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## Examples
Provide examples or code snippets that demonstrate how this feature works, or how it can be used in practice.
This helps with documentation and ensures maintainers can quickly understand and verify the change.
```ts
// Example usage
```
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## Checklist
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- [x] The changes are covered by relevant **tests**
- [x] I have verified the code works as intended locally
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## Additional Context
Add any additional context, related issues, or references that might help the reviewer understand this PR.
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