update: use singular form ANSIBLE_COLLECTIONS_PATH #11277

Job	Run time
awx-operator	12m 50s
awx_collection integration (a-h, ^[a-h])	14m 30s
awx_collection integration (i-p, ^[i-p])	18m 44s
awx_collection integration (r-z0-9, ^[r-z0-9])	17m 20s
awx_collection sanity (stable-2.17)	1m 35s
dev-env	7m 36s
api-test	5m 26s
api-migrations	5m 44s
api-lint	5m 22s
api-swagger	4m 59s
awx-collection	4m 56s
api-schema	5m 41s
combine awx_collection integration coverage	36s
	1h 45m 19s

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