vault: Only show the first status line
vault: Only show the first status line

The next version of the vault will return more lines as part
of the status. This will be useful when sending notification
emails, but this UI should only show the one-line summary.

SoftwareHeritage/swh-web-ui,SoftwareHeritage/swh-web-ui,SoftwareHeritage/swh-web-ui