derp/derphttp: add tests for proxied CONNECT port selection

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Adds two tests covering the fix in 0e4c8fc92:

TestDialNodeUsingProxyPort exercises dialNodeUsingProxy directly via a
stub CONNECT proxy, asserting the recorded target across four cases:
HTTPS/HTTP default fallback and explicit DERPPort override for each.

TestConnectThroughProxyHonorsDERPPort drives the full path end-to-end:
a real derpserver on an ephemeral TLS port, a real CONNECT proxy that
tunnels bytes bidirectionally, and a region client routed through it
via feature.HookProxyFromEnvironment. Without the fix, Connect fails
because the proxy is asked to dial :443.

Signed-off-by: Martin Zihlmann <martizih@outlook.com>

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