cli -netinfo: print oversized/extreme ping times as "-"

Summary:
This concludes backport of core#20115 [4/4]
https://github.com/bitcoin/bitcoin/pull/20115/commits/398045ba8b3694931069f88ec95553b3207dd1a6

Depends on D10709

Test Plan: ninja && src/bitcoind --daemon && sleep 5 && src/bitcoin-cli -netinfo 4 && src/bitcoin-cli stop

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10710