chore: test RouterOnRequest hook with subscriptions

[alepane21]

@coderabbitai summary

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

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[github-actions]

Router-nonroot image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-cc939d7c43e3aed998fd8e664841cabd47e8869c-nonroot

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.