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
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