Fix multiple [Producer name] tags on failures

On `rescue Kafka::Error` we're rerunning the whole method block
including `@logger.push_tags(@producer.to_s)`, but clearing tags
only in `ensure` which is not run on `retry`

Author: ojab

lib/kafka/async_producer.rb

@@ -212,31 +212,45 @@ def run
         @logger.push_tags(@producer.to_s)
         @logger.info "Starting async producer in the background..."
 
+        do_loop
+      rescue Exception => e
+        @logger.error "Unexpected Kafka error #{e.class}: #{e.message}\n#{e.backtrace.join("\n")}"
+        @logger.error "Async producer crashed!"
+      ensure
+        @producer.shutdown
+        @logger.pop_tags
+      end
+
+      private
+
+      def do_loop
         loop do
-          operation, payload = @queue.pop
-
-          case operation
-          when :produce
-            produce(payload[0], **payload[1])
-            deliver_messages if threshold_reached?
-          when :deliver_messages
-            deliver_messages
-          when :shutdown
-            begin
-              # Deliver any pending messages first.
-              @producer.deliver_messages
-            rescue Error => e
-              @logger.error("Failed to deliver messages during shutdown: #{e.message}")
-
-              @instrumenter.instrument("drop_messages.async_producer", {
-                message_count: @producer.buffer_size + @queue.size,
-              })
+          begin
+            operation, payload = @queue.pop
+
+            case operation
+            when :produce
+              produce(payload[0], **payload[1])
+              deliver_messages if threshold_reached?
+            when :deliver_messages
+              deliver_messages
+            when :shutdown
+              begin
+                # Deliver any pending messages first.
+                @producer.deliver_messages
+              rescue Error => e
+                @logger.error("Failed to deliver messages during shutdown: #{e.message}")
+
+                @instrumenter.instrument("drop_messages.async_producer", {
+                  message_count: @producer.buffer_size + @queue.size,
+                })
+              end
+
+              # Stop the run loop.
+              break
+            else
+              raise "Unknown operation #{operation.inspect}"
             end
-
-            # Stop the run loop.
-            break
-          else
-            raise "Unknown operation #{operation.inspect}"
           end
         end
       rescue Kafka::Error => e
@@ -245,16 +259,8 @@ def run
 
         sleep 10
         retry
-      rescue Exception => e
-        @logger.error "Unexpected Kafka error #{e.class}: #{e.message}\n#{e.backtrace.join("\n")}"
-        @logger.error "Async producer crashed!"
-      ensure
-        @producer.shutdown
-        @logger.pop_tags
       end
 
-      private
-
       def produce(value, **kwargs)
         retries = 0
         begin