update: use singular form ANSIBLE_COLLECTIONS_PATH (#15841) #11331

Job	Run time
awx_collection sanity (stable-2.17)	1m 51s
awx-operator	18m 27s
awx_collection integration (a-h, ^[a-h])	15m 5s
api-test	17m 36s
awx_collection integration (i-p, ^[i-p])	23m 17s
dev-env	11m 20s
api-migrations	14m 36s
awx_collection integration (r-z0-9, ^[r-z0-9])	18m 0s
api-lint	4m 50s
api-swagger	8m 41s
awx-collection	6m 47s
api-schema	11m 37s
combine awx_collection integration coverage	54s
	2h 33m 1s

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