fix(material/list): set initial focus on first selected option in selection list #23092
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Currently when a selection list receives focus, it forwards it either to the option that the user interacted with last or the first option in the list. This goes against the a11y best practices and is weird when there the user lands on the list for the first time and it has preselected options.
These changes switch to focusing the first selected option and falling back to the first option. This is consistent with the MDC implementation as well.
Fixes #22675.