selftests: net: test IPV6_FL_F_REMOTE

This flag retrieves the flow label seen by the socket at connection
setup via a getsockopt query. Therefore, the validation of this flag
requires a brief connection setup (source code for flow label shows
it must be TCP).

The simple TCP connection logic was wrapped inside two simple helpers,
because there are other uncovered features of flow label mgr that
could benefit from it (such as IPV6_FL_F_REFLECT).

Signed-off-by: Marcelo Mendes Spessoto Junior <marcelomspessoto@gmail.com>
Link: https://patch.msgid.link/20260807220942.421382-3-marcelomspessoto@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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