[vtadmin/testutil] Add testutil helper to manage the complexity of recursively calling WithTestServer #7601
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Description
This is a test-code–only change for VtctldServer and VTAdmin to make these recursive test server setups a little nicer to write, and to make doing table-driven tests on arbitrary numbers of vtctlds manageable.
I also added some reuse of a background context to these tests while I was there.
Checklist
Deployment Notes
Impacted Areas in Vitess
Components that this PR will affect: