Update select page object

[atmgrifter00]

Pull Request

🤨 Rationale

Recognized that as part of attempting to migrate an SLE component to the Select to use the grouping feature that there was a useful pageObject API for retrieving the options for a group by providing the group's label. This PR adds that functionality to the SelectPageObject.

👩‍💻 Implementation

Simple implementation mirroring a similar existing one.

🧪 Testing

Added test for the new pageObject method.

✅ Checklist

• [ ] I have updated the project documentation to reflect my changes or determined no changes are needed.

[atmgrifter00]

Dang it! I thought I had pushed the changes to the change file, but didn't notice the failure before I squashed the changes.

NOTICE: This was technically a breaking change, as the SelectPageObject method getGroupOptionLabels was renamed to getGroupOptionLabelsByIndex.