feat(listbox-button): added postfix-label

[agliga]

Description

• Added postfix-label to listbox
• Wrapped it in a span because the team needs this to override in order to test their gold standard
• No documentation added. This is not a pattern we want to expose

References

https://github.com/eBay/ebayui-core/issues/2201

Screenshots

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e60b777540b177009602c16652251c63da81f5bc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ----------------- | ----- | | @ebay/ebayui-core | Minor |

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[agliga]

Seems like formatter changed one of the lines.