(#1657) Updates combo box selected event details to be array

[dlescarbeau]

Closes #1657

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Author PR Checklist

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General:

• [ ] I have reviewed the acceptance criteria defined in the ticket and ensured the work has been completed.
• [ ] The commit message passes all quality commit message standards.
• [ ] Unit tests have been updated or created to reflect any javascript changes.
• [ ] Storybook scenarios have been updated or created to reflect any html/css/js changes.

Accessibility:

• [ ] WCAG 2.1 Level AA requirements have been met.

Development:

• [ ] Any new or updated javascript code has 100% unit test coverage.
• [ ] New or updated breakpoints have regression images.
• [ ] Breaking changes have been thoroughly documented in the PR.

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• [ ] There are no unexpected or unapproved regression image changes.

• [ ] Functionality of interactive elements meet the acceptance criteria.
• [ ] The product is visually and functionally the same across the different browsers.

Accessibility:

• [ ] AxeDev Tools: there are no new or outstanding accessibility issues introduced in this PR.
• [ ] Lighthouse: scores have not noticeably decreased during this PR.
• [ ] Wave: there are no new errors or contrast errors introduced in this PR.

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General:

• [ ] New or updated features introduced in this PR are developed mobile-first.
• [ ] Breakpoint changes and regression images match those breakpoints.
• [ ] This PR has been tested in all supported browsers at all breakpoints.

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• [ ] New code passes code quality standards set by industry standards.
• [ ] The expected Storybook stories have been added or updated for the new or updated feature.
• [ ] The expected unit tests have been added or updated for the new or updated feature.

Accessibility:

• [ ] VoiceOver: Described content matches with what was expected.
• [ ] Keyboard navigation: new or updated features and content are navigable via the keyboard.

[github-actions[bot]]

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• NCIDS JS Documentation
• The storybook site
• The example site

[bennettcc]

This PR needs to be tested on an ODE