continue adding Handler logic; remove unused TxQueue tests

internal/debug_noheaplog.go

@@ -9,6 +9,10 @@ import (
 
 const HeapAllocDebugging = false
 
+func LogEnabled(l *slog.Logger, lvl slog.Level) bool {
+	return l != nil && l.Handler().Enabled(context.Background(), lvl)
+}
+
 // LogAttrs is a helper function that is used by all package loggers and that
 // can be switched out with the `debugheaplog` build tag for a non-allocating
 // logger that prints out when heap allocations occur.