Cleanup ide.host.json files.

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Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Consider the following changes:

1. New schema is available on schemastore: ide.host instead of vs-2017.3.host
2. Remove ports section - not used by current Visual Studio
3. Remove supportedAuthentication section - not used by current Visual Studio

Anything else that is not documented in the schema, is potential removal candidate, please confirm with @phenning.

Expected Behavior

Clean up of unreferenced properties, updated schema.

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

No response

Anything else?

Visual Studio 2022 17.3 Preview 1

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//cc @DamianEdwards

Thanks for contacting us.

We're moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.