Make report type artifacts downloadable from the job details page

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#23847 (closed) made report type artifacts downloadable from the pipeline index by introducing Ci::JobArtifact::DOWNLOADABLE_TYPES. However, additional changes are necessary for these artifacts to be downloadable from the job details page:

1. The download button must appear when any downloadable artifact is present. Currently it only appears if an archive artifact is present

2. The download feature should give the user the option to select which artifact from the job to download. The gif below shows the current behavior - the download button only downloads the archive artifact

Screen_Recording_2020-05-27_at_3.42.17_PM

3. The keep and browse button features also need to be updated in order to work with report type artifacts