Remove unused SetupEmberAfCommandSender function.

[bzbarsky-apple]

We have not been using this since we stopped going through generic dispatch for CommandSender.

Problem

Unused code.

Change overview

Remove it.

Testing

It's not used.

[github-actions]

PR #15945: Size comparison from 1f458a5 to 8d269a6

Increases (8 builds for cyw30739, k32w, mbed, nrfconnect, telink)

platform	target	config	section	1f458a5	8d269a6	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	601770	601802	32	0.0
			.app_xip_area	506312	506344	32	0.0
	lock	cyw930739m2evb_01	(read/write)	559690	559722	32	0.0
			.app_xip_area	465768	465800	32	0.0
	ota-requestor	cyw930739m2evb_01	(read/write)	581878	581910	32	0.0
			.app_xip_area	478276	478308	32	0.0
k32w	light	k32w061+release	(read/write)	694820	694852	32	0.0
			.text	609352	609384	32	0.0
	lock	k32w061+release	(read/write)	696424	696456	32	0.0
			.text	610980	611012	32	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read/write)	2350812	2350876	64	0.0
			.text	1313412	1313476	64	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1151795	1151827	32	0.0
			text	785512	785544	32	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	888946	888978	32	0.0
			text	628306	628342	36	0.0

Decreases (2 builds for esp32)

platform	target	config	section	1f458a5	8d269a6	change	% change
esp32	all-clusters-app	c3devkit	(read only)	957534	957506	-28	-0.0
			.flash.text	957534	957506	-28	-0.0
		m5stack	(read only)	1012295	1012255	-40	-0.0
			.flash.text	1006911	1006871	-40	-0.0

Full report (18 builds for cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	1f458a5	8d269a6	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	601770	601802	32	0.0
			.app_xip_area	506312	506344	32	0.0
			.bss	78140	78140	0	0.0
			.data	660	660	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	559690	559722	32	0.0
			.app_xip_area	465768	465800	32	0.0
			.bss	76644	76644	0	0.0
			.data	624	624	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor	cyw930739m2evb_01	(read/write)	581878	581910	32	0.0
			.app_xip_area	478276	478308	32	0.0
			.bss	85972	85972	0	0.0
			.data	592	592	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	920868	920868	0	0.0
			(read/write)	128848	128848	0	0.0
			.bss	126768	126768	0	0.0
			.data	2080	2080	0	0.0
			.text	920860	920860	0	0.0
		BRD4161A+rpc	(read only)	949688	949688	0	0.0
			(read/write)	144808	144808	0	0.0
			.bss	142544	142544	0	0.0
			.data	2260	2260	0	0.0
			.text	949680	949680	0	0.0
	window-app	BRD4161A	(read only)	853888	853888	0	0.0
			(read/write)	126840	126840	0	0.0
			.bss	124912	124912	0	0.0
			.data	1924	1924	0	0.0
			.text	853880	853880	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	957534	957506	-28	-0.0
			(read/write)	1393618	1393618	0	0.0
			.dram0.bss	63432	63432	0	0.0
			.dram0.data	14236	14236	0	0.0
			.flash.rodata	197032	197032	0	0.0
			.flash.text	957534	957506	-28	-0.0
			.iram0.text	62016	62016	0	0.0
		m5stack	(read only)	1012295	1012255	-40	-0.0
			(read/write)	460724	460724	0	0.0
			.dram0.bss	68960	68960	0	0.0
			.dram0.data	34080	34080	0	0.0
			.flash.rodata	225848	225848	0	0.0
			.flash.text	1006911	1006871	-40	-0.0
			.iram0.text	123107	123107	0	0.0
k32w	light	k32w061+release	(read/write)	694820	694852	32	0.0
			.bss	77704	77704	0	0.0
			.data	1964	1964	0	0.0
			.text	609352	609384	32	0.0
	lock	k32w061+release	(read/write)	696424	696456	32	0.0
			.bss	77672	77672	0	0.0
			.data	1972	1972	0	0.0
			.text	610980	611012	32	0.0
linux	chip-tool-ipv6only	arm64	(read only)	9430548	9430548	0	0.0
			(read/write)	454177	454177	0	0.0
			.bss	43825	43825	0	0.0
			.data	1200	1200	0	0.0
			.data.rel.ro	351000	351000	0	0.0
			.dynamic	560	560	0	0.0
			.got	54360	54360	0	0.0
			.init	24	24	0	0.0
			.init_array	192	192	0	0.0
			.rodata	486556	486556	0	0.0
			.text	7940244	7940244	0	0.0
	thermostat-no-ble	arm64	(read only)	2174612	2174612	0	0.0
			(read/write)	148465	148465	0	0.0
			.bss	65201	65201	0	0.0
			.data	1080	1080	0	0.0
			.data.rel.ro	75000	75000	0	0.0
			.dynamic	560	560	0	0.0
			.got	4216	4216	0	0.0
			.init	24	24	0	0.0
			.init_array	352	352	0	0.0
			.rodata	133012	133012	0	0.0
			.text	1823312	1823312	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2350812	2350876	64	0.0
			.bss	186084	186084	0	0.0
			.data	5800	5800	0	0.0
			.text	1313412	1313476	64	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1151795	1151827	32	0.0
			bss	146792	146792	0	0.0
			rodata	144300	144300	0	0.0
			text	785512	785544	32	0.0
p6	all-clusters-app	default	(read/write)	2494064	2494064	0	0.0
			.bss	119504	119504	0	0.0
			.data	2696	2696	0	0.0
			.text	1452328	1452328	0	0.0
	light-app	default	(read/write)	2397504	2397504	0	0.0
			.bss	112976	112976	0	0.0
			.data	2544	2544	0	0.0
			.text	1355768	1355768	0	0.0
	lock-app	default	(read/write)	2360936	2360936	0	0.0
			.bss	112720	112720	0	0.0
			.data	2504	2504	0	0.0
			.text	1319200	1319200	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	888946	888978	32	0.0
			bss	86928	86928	0	0.0
			noinit	37160	37160	0	0.0
			text	628306	628342	36	0.0

[woody-apple]

Fast tracking pure code deletion that has passed CI