[release/6.0-staging] Remove Windows 7 helix queues #100988
                
     Merged
            
            
          
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Backport of #100981 to release/6.0-staging
Customer Impact
Due to changing internal requirements, Helix is decomissioning the Win7 queues.
As a result, we need to stop sending work to them before they are turned off (as any build that uses them after that point will fail.
Regression
Testing
Infrastructure-only removal of a queue, no testing necessary.
Risk
Low: Simple removal of a Helix queue. We do lose some test coverage, but we can't keep the queue around.
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging, notrelease/X.0.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.