Merge bitcoin/bitcoin#30404: Use WITH_LOCK in Warnings::Set

6af51e8198 Use WITH_LOCK in Warnings::Set (Ava Chow)

Pull request description:

  The scope of the lock should be limited to just guarding m_warnings as anything listening on `NotifyAlertChanged` may execute code that requires the lock as well.

  Fixes #30400

ACKs for top commit:
  maflcko:
    lgtm ACK 6af51e8198
  TheCharlatan:
    ACK 6af51e8198
  glozow:
    ACK 6af51e8198
  willcl-ark:
    ACK 6af51e8198
  stickies-v:
    ACK 6af51e8198

Tree-SHA512: 9884046c70dcad996276931b6d154f0330200332403828f34f7f7b285fc0e770ba7b25056131ab24dcb8a4b18f58d31633aa17fbb09b0eaea8a29e28fca10ec4

src/node/warnings.cpp

@@ -28,8 +28,7 @@ Warnings::Warnings()
 }
 bool Warnings::Set(warning_type id, bilingual_str message)
 {
-    LOCK(m_mutex);
+    const auto& [_, inserted]{WITH_LOCK(m_mutex, return m_warnings.insert({id, std::move(message)}))};
-    const auto& [_, inserted]{m_warnings.insert({id, std::move(message)})};
     if (inserted) uiInterface.NotifyAlertChanged();
     return inserted;
 }