fix: use same promise when closing maconn multiple times

[twoeths]

Title

Use same promise when closingMultiaddrConnection multiple time

See #2478 (review)

Description

• Replace status variable introduced in fix: close MultiaddrConnection once #2478 with a closePromise
• use this closePromise for subsequent maConn.close() calls
• the new unit test in fix: close MultiaddrConnection once #2478 passed

related to #2477

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works

[achingbrain]

Thanks!

[twoeths]

@achingbrain could you please release libp2p-tcp? would like to test this fix with lodestar v1.18 to see if the leaked sockets are still there
cc @wemeetagain

[twoeths]

v9.0.22 was released including this PR, thanks @achingbrain