test: addrman: check isTerrible when time is more than 10min in the future #33533

This PR adds test coverage to kill the following mutant (https://corecheck.dev/mutation/src/addrman.cpp#L76):

diff --git a/src/addrman.cpp b/src/addrman.cpp
index 9c3a24db90..0ffd349315 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -73,7 +73,7 @@ bool AddrInfo::IsTerrible(NodeSeconds now) const
     }

     if (nTime > now + 10min) { // came in a flying DeLorean
-        return true;
+        return false;
     }

When the nTime is set 10 minutes in the future the addr should be marked as terrible.

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33533.

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LLM Linter (✨ experimental)

Possible typos and grammar issues:

• should be isTerrible = true -> should be isTerrible == true [makes the intent clear that this is a boolean check rather than an assignment; improves readability of the comment]

^{drahtbot_id_5_m}

crACK 8e47ed6906d5e381498681e2cab9f2e318597705

tACK 8e47ed6906d5e381498681e2cab9f2e318597705

I verified that mutating the isTerrible condition did not cause any tests to fail on master, while this PR correctly triggers a test failure.

Nice, code review ACK 8e47ed6906d5e381498681e2cab9f2e318597705