Cleanup cluster-agent and workspaces-config GraphQL type specs

What does this MR do and why?

This MR cleans existing GraphQL type specs, by removing resolver-level specs that have been addressed in existing GraphQL resolver specs

see GraphQL testing guidelines

References

Came across this while cleaning up see: Rename remoteDevelopmentClusterAgents type inte... (#536263 - closed)

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Before	After

How to set up and validate locally

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