Resolve element optionality via both optional attribute and conformance #3886

Job	Run time
Cypress UI tests with Zigbee data (20.x, ubuntu-22.04)	5m 55s
Cypress UI tests with Matter data (20.x, ubuntu-22.04)	5m 58s
Generation and back-end tests (20.x, ubuntu-22.04)	7m 23s
Code coverage (20.x, ubuntu-22.04)	1m 41s
Build ZAP (macos-14)	9m 16s
Build ZAP (ubuntu-22.04)	7m 56s
Create Github Release	0s
	38m 9s

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