[combobox, list, pick-list] filter should apply to groups

[jcfranco]

Check existing issues

• [X] I have checked for existing issues to avoid duplicates

Actual Behavior

The current filtering only applies to items, but should also include groups and any matches should show all items under a matching group.

Expected Behavior

Filter applies to both items and groups.

Reproduction Sample

https://codepen.io/jcfranco/pen/yLGgmWv?editors=100

Reproduction Steps

1. Focus on a component's filter/input
2. Type the search text displayed in any use case's placeholder text
3. Group and child items are not displayed.

Reproduction Version

1.8.0

Relevant Info

No response

Regression?

No response

Priority impact

p4 - not time sensitive

Impact

No response

Calcite package

• [X] @esri/calcite-components
• [ ] @esri/calcite-components-react

Esri team

Calcite (dev)

[geospatialem]

Priority and expertise sought from the design team.

[ashetland]

No hesitation from design. 🚀

[github-actions[bot]]

cc @geospatialem, @brittneytewks