client: fix binary logging bug which logs a server header on a trailers only response #5763
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Fixes #5706. Uses an invariant of the system, s.noHeaders, and propagates that signal to the client stream to gate the Server Header logging call. No explicit test, but have tests that test this at very specific granularity and you can see deleting the Server Header expectation for the want makes the tests pass.
RELEASE NOTES: