Put duplicate plugin location in error message (#15781) #11126

Job	Run time
api-test	13m 27s
api-migrations	10m 28s
api-lint	1m 25s
api-swagger	4m 53s
awx-collection	2m 40s
api-schema	7m 24s
dev-env	10m 4s
awx-operator	12m 11s
awx_collection integration (a-h, ^[a-h])	12m 0s
awx_collection integration (i-p, ^[i-p])	15m 24s
awx_collection integration (r-z0-9, ^[r-z0-9])	14m 46s
awx_collection sanity (stable-2.17)	1m 30s
combine awx_collection integration coverage	29s
	1h 46m 41s

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