Change `contentType` with `icon` for unit buttons

Description

This PR is a part of edx/edx-platform#21433. As the learning UI is moving to MFE, we ported the LMS frontend changes here.

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Piotr Surowiec

Repo

edx/frontend-app-learning

Customer

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

Learner Experiences - Course Experience

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

Priority

Unset
Configure