fix(select): ensure popover options with number values are searched for correctly

[averyjohnston]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: Resolves #23856

When clicking an option with a number value in a popover (ex: value="5"), the dropdown doesn't dismiss and the value isn't updated.

What is the new behavior?

• When getting which option was clicked, the value for the clicked option is now casted to a string to mirror the values being checked against. (Before, if the option had value="5", the find loop would check "5" === 5 so no option was ever found.)
• Code DRY'd up somewhat by pulling repeat find loops into a separate helper function.

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

Great job!