AAP-38230 Fix metrics pipe vs send buffering race condition #10911

Job	Run time
awx-operator	12m 14s
awx_collection integration (a-h, ^[a-h])	13m 26s
awx_collection sanity (stable-2.17)	1m 30s
awx_collection integration (i-p, ^[i-p])	16m 9s
awx_collection integration (r-z0-9, ^[r-z0-9])	15m 42s
api-test	13m 52s
dev-env	5m 49s
api-migrations	10m 26s
api-lint	1m 24s
api-swagger	4m 41s
awx-collection	2m 27s
api-schema	7m 23s
combine awx_collection integration coverage	1m 7s
	1h 46m 10s

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