Data size should be in GB

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Steps to reproduce

1. Go to data migration menu

Expected behaviour

Estimated size: 79.96 GB

Actual behaviour

Estimated size: 79968 MiB

Server configuration

Web server: Apache/Nginx

Database: MySQL/Maria/SQLite/PostgreSQL

PHP version: 8.2/8.3/8.4

Nextcloud version: (see Nextcloud admin page)

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Browser

Browser name: Firefox/Chrome/Safari/…

Browser version: 124/125/…

Operating system: Windows/Ubuntu/Mac/…

Insert your browser log here, this could for example include:
a) The javascript console log
b) The network log
c) ...

Start at the data migration menu and trace where the estimated size is formatted for display. Reproduce the reported MiB value, update the display behavior to show the expected GB value, and verify that the menu reports the corrected unit and amount.