Change the revoke button to type `tertiary`

What does this MR do and why?

We decided this change was better than these two other proposals:

• Draft: Change the revoke button type to secondary
• Draft: Change the revoke button to 3 different types

In the AccessTokenTableApp component, users may not understand why some access tokens have a primary revoke button (background red), while other access tokens have a secondary (transparent background).

Originally, I believe the primary|secondary buttons were meant to match the color of the text of the Expires column (3 colors: red for expired token, orange for soon-to-be-expired, black for tokens without expiration). However, the match for the button was not perfect: primary button for tokens with expiration, secondary button for tokens without expiration.

This MR changes the revoke buttons to be of type tertiary.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Create a number of personal access tokens with different expiration dates in http://127.0.0.1:3000/-/profile/personal_access_tokens

MR acceptance checklist

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