[Bug]: duplicate entry in sdkPackage.models

[jhendrixMSFT]

Describe the bug

The models array contains two entries for KeyEncryptionKeyIdentity.

Reproduction

Build https://github.com/Azure/azure-rest-api-specs/tree/main/specification/devcenter/DevCenter.Management

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.