Make the general and dataset-details Export panes consistent

[mbaumann-broad]

Discussed in Slack here.

Currently, File Manifest export is on the dataset-details Metadata pane.
Moving that to the Export pane is more consistent with the general export page.

(With ff=verabim enabled) the dataset-details Export pane would then look like the general export page:

[MillenniumFalconMechanic]

See mocks (and UI background).

[NoopDog]

Hi @frano-m, this is approved to develop!

[frano-m]

To consider:

• Handling of user log in and log out.
• Loading states.

[NoopDog]

@frano-m, this is on cc-dev. Can you take it for a spin and check if it looks ok? Thx. We especially want to be sure the verbatim PFB stuff is still ok and also the normal exports work as well. We want to ensure the number of requests and summaries are the same as on the main. Also, the exports create the same URLs to Azul. Thanks!