Convert mr approval feature tracking to use `this.track` on `@click`
The following discussion from !166281 should be addressed:
- [ ] @dstull started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166281#note_2138103126): (+2 comments)
> **question (non-blocking):**
>
> Should we technically be using a `gl-button` here with `variant="link"` here now as per gitlab-ui guidance [here](https://gitlab.com/gitlab-org/gitlab-ui/blob/a5dbd91e409e272827c80810bf10c6304f90453b/src/components/base/banner/banner.stories.js#L74-74)?
- [ ] Convert to `gl-button` with variant type `link` as well
issue