Remove "font: inherit" in gl-link usages in the project

Description

Now that gitlab-ui!3754 (merged) is merged and deployed, we can remove redundant CSS font: inherit; and classes like gl-reset-font-size from our links as they don't have any effect.

We can simply remove the class in most cases, from:

<gl-link ... class="gl-reset-font-size">

To:

<gl-link ... >