Core: Force logging of critical errors (#4061)

* Ignore enabled flag on critical log entries

This ensures critical errors (asserts and unreachables) are logged when the log file exceeds 100MB, or when logging is disabled.

* I apparently need sleep

src/common/logging/backend.cpp

@@ -70,7 +70,7 @@ public:
     ~FileBackend() = default;
 
     void Write(const Entry& entry) {
-        if (!enabled) {
+        if (!enabled && entry.log_level != Level::Critical) {
             return;
         }