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The msgStream's backpressure queue previously used a drop predicate that always returned false, meaning messages were never dropped based on queue length. This commit introduces a new drop predicate mechanism for the msgStream queue, controlled by build tags. For non-integration builds, the predicate combines a type-based check with Random Early Detection (RED): - Certain critical message types (`lnwire.LinkUpdater`, `lnwire.AnnounceSignatures1`) are marked as protected and are never dropped. - For other message types, RED is applied based on the queue length, using `redMinThreshold` and `redMaxThreshold` to determine the drop probability. For integration builds, the predicate always returns false, preserving the previous behavior to avoid interfering with tests. This change allows the msgStream queue to proactively drop less critical messages under high load, preventing unbounded queue growth while ensuring essential messages are prioritized.