Rename useFetchUser to useUser #17547

Job	Run time
Core Basic (18.x)	6m 14s
Core Basic (20.x)	6m 38s
Core Basic - Plone 5 (18.x)	6m 33s
Core Blocks (18.x)	8m 39s
Core Blocks - Listing (18.x)	5m 22s
Core Blocks (20.x)	8m 34s
Core Content (18.x)	2m 59s
Core Blocks - Listing (20.x)	5m 0s
Core Content (20.x)	3m 7s
Core Control Panels (18.x)	4m 42s
Coresandbox (18.x)	5m 44s
Core Volto Slate (18.x)	7m 14s
Core Control Panels (20.x)	4m 20s
Core Volto Slate (20.x)	7m 12s
Deployment Mode (18.x)	6m 28s
Project Generator (18.x)	6m 44s
Project Generator (20.x)	6m 32s
Multilingual (18.x)	3m 12s
Multilingual in Deployment Mode (18.x)	3m 14s
Working Copy (18.x)	3m 30s
	1h 51m 58s

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