HTTP context servers don’t support the settings field, so remove it
during migration to avoid confusion. Other context server types are
unaffected.

Closes #44786.


https://github.com/user-attachments/assets/4cabf405-c9e7-4d6e-a43d-f642fc4771e0



Release Notes:

- Removed deprecated key from HTTP `context_servers`

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: Bennet Bo Fenner <bennet@zed.dev>