Fix error wrapping for errors in HTTP2 server preface #6639
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What?
This PR fixes the error wrapping that happens in the server preface and a test for it.
The test emulates communication when the client uses an incapable certificate (it's valid, but only can be used for email protection).
Why?
Without the fix commit the Dial will do constant retries till the context is canceled.
Resolves: #6593