fix: Backport Rack proxy event to middleware #2212

Job	Run time
postgresql / pg / ubuntu-latest	1m 10s
mysql / mysql2 / ubuntu-latest	54s
postgresql / que / ubuntu-latest	59s
mysql / trilogy / ubuntu-latest	51s
kafka / racecar / ubuntu-latest	3m 32s
kafka / rdkafka / ubuntu-latest	4m 4s
rabbitmq / bunny / ubuntu-latest	33s
kafka / ruby_kafka / ubuntu-latest	1m 23s
redis / redis / ubuntu-latest	45s
redis / resque / ubuntu-latest	1m 2s
other / dalli / ubuntu-latest	1m 13s
redis / sidekiq / ubuntu-latest	1m 9s
other / mongo / ubuntu-latest	1m 13s
	18m 48s

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