[igxPivotSelector] Selector list items do not take into account the `displayName` of the values.

[MayaKirova]

Description

Related to #10736
When displayName is set it changes the text in the chip, but does not affect the matching element in the selector.

• igniteui-angular version:
• browser:

Steps to reproduce

1. Open the pivot grid dev sample.
2. Observe the Amount of Sale chip and the matching item in the selector.

Result

Their text mismatches. One uses displayName, the other member.

Expected result

They should both show the specified displayName.

Attachments

Attach a sample if available, and screenshots, if applicable.