itest: fix flake in testAnchorThirdPartySpend

[yyforyongyu]

Cherry-picked from the sweeper PR.

When mining lots of blocks in the itest, the subsystems can be out of
sync in terms of the best block height. We now assert the num of pending
sweeps on Alice's node to give her more time to sync the blocks,
essentially behaving like a time.Sleep as in reality, the blocks would
never be generated this fast.

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[ellemouton]

lgtm! 🧹

[guggero]

Nice fix, LGTM 🎉