control/controlhttp: allow setting, getting Upgrade headers in Noise upgrade

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Not currently used, but will allow us to usually remove a round-trip for
a future feature.

Updates #5972

Change-Id: I2770ea28e3e6ec9626d1cbb505a38ba51df7fba2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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