Migrated two links to tertiary buttons

Katie Macoyrequested to merge
241577-link-variant-board-settings into master

What does this MR do and why?

This is part of Pajamas Migration Day..

We updated our styling of the link variant button to represent a link (blue text). With this change, we also introduced a new button category (tertiary), which are styled as secondary buttons without a background or border. Prior to this change, the link variant was often used in cases where a button was needed without a border.

The two links as part of this issue could be migrated to tertiary buttons. I reviewed similar areas of GitLab, like the MR sidebar and noticed that similar elements were tertiary buttons:

Screenshot_2023-03-10_at_12.42.44

Screenshots or screen recordings

Before After
Screenshot_2023-03-10_at_12.43.51 Screenshot_2023-03-10_at_12.38.37
Screenshot_2023-03-10_at_12.43.55 Screenshot_2023-03-10_at_12.38.34

How to set up and validate locally

Img Desc
Screenshot_2023-03-10_at_12.46.21 1. Visit any board (Enter a Project > From Issues on the sidebar, select Boards)
Screenshot_2023-03-10_at_13.31.43 2. Create a new list on the board (From the top bar, click the Create list button
Screenshot_2023-03-10_at_13.28.23 3. Create a new list by clicking add to board
Screenshot_2023-03-10_at_13.29.02 4. Click the overflow menu of the new list & click Edit list settings
Screen_Recording_2023-03-10_at_13.30.31 5. Click Edit, add a limit to see Remove button

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #241577 (closed)

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