Address DNS-SD issues

[chrisdecenzo]

Problem

• Issue DNS-SD pairing hint field is incorrect when using BCM and already commissioned #16237: DNS-SD pairing hint field is incorrect when using BCM and already commissioned
• Issue Extended Discovery cannot be set to 24 hours #16624: Extended Discovery cannot be set to 24 hours
• Issue tv-casting broken when tv-app has IPv4 disabled #16680: tv-casting broken when tv-app has IPv4 disabled

Change overview

• use "initial" pairing hint value when not yet commissioned, and not only during ECM (current logic)
• change extended discovery timeout value from int16 to int32 to allow longer values
• do not prefer v4 address in UDC when v4 is disabled (prefer v6 address)

Testing

How was this tested? (at least one bullet point required)

• Run sample device, use chip-tool to discover commissionables and check the PH values when not commissioned, and when put in commissioning mode via BCM and ECM.

[github-actions]

PR #16625: Size comparison from 011efcf to 4038dc0

Decreases (1 build for nrfconnect)

platform	target	config	section	011efcf0	4038dc0	change	% change
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	text	780764	780760	-4	-0.0

Full report (1 build for nrfconnect)

platform	target	config	section	011efcf0	4038dc0	change	% change
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1140039	1140039	0	0.0
			bss	142512	142512	0	0.0
			rodata	141912	141912	0	0.0
			text	780764	780760	-4	-0.0