[Steven Vukelich (vukelich)]

What does this PR do?

Finalizes the setting for several data plane service endpoints to use the "new" subdomain checking algorithm, i.e., going from UseLegacyCheck: true to UseLegacyCheck: false in core/Microsoft.Mcp.Core/src/Helpers/EndpointValidator.AllowLists.cs. See the comments higher up in EndpointValidator.AllowLists.cs for what UseLegacyCheck means as well as EndpointValidator.cs for the impact on implementation.

Also continuing the small clearing out of the old Germany cloud entries since it's gone.

GitHub issue number?

[Link to the GitHub issue this PR addresses]

Pre-merge Checklist

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