Remove use asyncPropExtenders for /controlpanel route when prefixed #14073

Job	Run time
Core Basic (18.x)	6m 10s
Core Basic (20.x)	6m 0s
Core Blocks (18.x)	7m 5s
Core Content (18.x)	3m 21s
Core Content (20.x)	2m 55s
Core Control Panels (18.x)	4m 4s
Core Blocks (20.x)	7m 4s
Core Control Panels (20.x)	3m 50s
Core Basic - Plone 5 (18.x)	6m 36s
Core Blocks - Listing (18.x)	5m 47s
Coresandbox (18.x)	3m 51s
Core Blocks - Listing (20.x)	4m 42s
Core Volto Slate (18.x)	7m 4s
Core Volto Slate (20.x)	7m 7s
Multilingual (18.x)	3m 16s
Working Copy (18.x)	3m 26s
Project Generator (18.x)	5m 33s
Multilingual in Prefixed site (20.x)	3m 14s
Project Generator (20.x)	5m 8s
Multilingual in Seamless Mode (18.x)	3m 15s
Prefixed site (20.x)	3m 31s
Seamless Mode (18.x)	6m 15s
	1h 49m 14s

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