This PR adds test coverage for the case that an address is considered terrible if we had N successive failures in the last week.
It kills the following mutant (https://corecheck.dev/mutation/src/addrman.cpp#L88):
0diff --git a/src/addrman.cpp b/src/addrman.cpp
1index e3981e6a40..f8045491c1 100644
2--- a/src/addrman.cpp
3+++ b/src/addrman.cpp
4@@ -65,7 +65,7 @@ bool AddrInfo::IsTerrible(NodeSeconds now) const
5 }
6
7 if (now - m_last_success > ADDRMAN_MIN_FAIL && nAttempts >= ADDRMAN_MAX_FAILURES) { // N successive failures in the last week
8- return true;
9+ return false;
10 }
11
12 return false;