Resolve element optionality via both optional attribute and conformance #3890

Job	Run time
Cypress UI tests with Zigbee data (20.x, ubuntu-22.04)	6m 12s
Cypress UI tests with Matter data (20.x, ubuntu-22.04)	6m 4s
Generation and back-end tests (20.x, ubuntu-22.04)	7m 11s
Code coverage (20.x, ubuntu-22.04)	1m 19s
Build ZAP (macos-14)	7m 53s
Build ZAP (ubuntu-22.04)	7m 28s
Create Github Release	0s
	36m 7s

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