fix(datadog): report consumer username tag (#11354) #16

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/http3/admin)	14m 35s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	27m 43s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	24m 19s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	24m 28s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	24m 35s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/http3/admin)	14m 2s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	25m 25s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	26m 12s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	23m 59s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	35m 51s
	4h 1m 9s

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