Improve Darwin OTA tests.

[bzbarsky-apple]

• Make it possible to hook all the delegate callbacks in the test.
• Add a test for responding BUSY and then being able to handle the retry, disabled for now until we make it possible for it to run quickly.

[github-actions]

PR #25923: Size comparison from 12072b3 to 2e9383d

Full report (1 build for cc32xx)

platform	target	config	section	12072b3	2e9383d	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	645825	645825	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933102	933102	0	0.0
			.debug_aranges	87704	87704	0	0.0
			.debug_frame	301596	301596	0	0.0
			.debug_info	20310331	20310331	0	0.0
			.debug_line	2681125	2681125	0	0.0
			.debug_loc	2827568	2827568	0	0.0
			.debug_ranges	286448	286448	0	0.0
			.debug_str	3041144	3041144	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105953	105953	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	380543	380543	0	0.0
			.symtab	257472	257472	0	0.0
			.text	537752	537752	0	0.0

[bzbarsky-apple]

Fast-tracking platform-specific change with platform owner review.

[MrLiuYunPing]

why is android not supported?

[MrLiuYunPing]

I want to use Android app to OTA the device, but when I announce the device with the controller noideId and Set OTA delegate, but uint16_t ep = emberAfFindClusterServerEndpointIndex(endpoint, OtaSoftwareUpdateProvider::Id); ep is always 65535, the kEmberInvalidEndpointIndex. I do't know why? iOS is OK.

[bzbarsky-apple]

@MrLiuYunPing What does that have to do with a pull request that adds unit tests for the Darwin Matter.framework?