sessionrecording: close idle connections after upload

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If we don't close the connection between SSH server and recorder
explicitly once it's idle after the upload stream is closed, the
connection stays open and holds on to a port on the server. This
leads to port exhaustion on the server in the medium to long run.

To avoid this, close the idle connections explicitly. As an extra
step of precaution, set an idleConnTimeout of 30 seconds on both
the HTTP1 and HTTP2 recorder clients.

Updates tailscale/corp#43742

Signed-off-by: Gesa Stupperich <gesa@tailscale.com>

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