OpenAPI docs with webhooks + schema refs fail with filtering

### Description

```bash
Considering target 'GitHubAPI':
- Trying OpenAPI code generation.
Error: Failed to satisfy: JSONSchema reference can be found in components/schemas at path: .webhooks.branch-protection-configuration-disabled.post.requestBody.content['application/json'].schema
Failed to satisfy: JSONSchema reference can be found in components/schemas at path: .webhooks.branch-protection-configuration-enabled.post.requestBody.content['application/json'].schema
```
There are a lot more similar `Failed to satisfy` errors.

### Reproduction

Try to use the OpenAPI Generator on https://github.com/github/rest-api-description/blob/main/descriptions-next/api.github.com/api.github.com.yaml

### Package version(s)

generator 1.6.0
runtime 1.7.0

### Expected behavior

work.

### Environment

Swift 6.0.3

### Additional information

_No response_

Reproduce the failure with OpenAPI Generator against the linked GitHub API description using generator 1.6.0 and runtime 1.7.0. Trace how filtering handles the webhook request-body schema references; done means the document generates without the reported “Failed to satisfy” errors.

Written by the indexing model from the issue text.