update overlay to not remove getAlias response

[ismaelrumzan]

https://vercel.slack.com/archives/C02F56A54LU/p1754961456735209

Running speakeasy generator locally on this PR

Downloading Speakeasy version 1.603.0
                                     
│     └─Diagnosing OpenAPI - success           
│     └─Tracking OpenAPI Changes - success     
│       └─Snapshotting Resolved Layer - success
│       └─Storing OpenAPI Revision - success   
│     └─Computing Document Changes - success   
│       └─Downloading prior revision - success 
│       └─Computing changes - success          
│       └─Uploading changes report - success   
│   └─Validating gen.yaml - success 

[ismaelrumzan]

The reason this was removed is because it used to fail the speakeasy spec validator. It does not anymore (Ran it locally)