fix(): update iscomboboxitemselected function to pay attention to selection mode

[jordantsanz]

1. Description: Adds selectionMode property to combobox so that multiple selectionMode does not automatically select parents by default

2. Instructions for testing:

3. Closes Issues: # (if appropriate)

4. Updated meaningful TSDoc to methods including Parameters and Returns, see Documentation Guide

5. used semantic commit messages

6. PR title follows semantic commit format (CRITICAL if the title is not in a semantic format, the release automation will not run!)

7. updated peerDependencies as needed. CRITICAL our automated release system can not be counted on to update peerDependencies so we must do it manually in our PRs when needed. See the updating peerDependencies section of the release instructions for more details.

[github-actions]

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