[Enhancement] The import preview should still be visible after moving to another section of the admin panel and then coming back

[Softvision-GeluHaiduc]

[Affected Versions]:

• Firefox Release 84.0.2

[Affected Platforms]:

• Windows 10x64

[Prerequisites]:

• Make sure to use never before imported packs.

[Steps to reproduce]:

1. Click the "Import Content" list item from the left side menu in the "Content" section.
2. Input a valid URL to a pack of avatars/scenes and click the "Preview Import" button.
3. Click the "Import # Items" button.
4. Click the "Approved avatars" list item from the left side menu in the "Content" section.
5. Click the "Import Content" again and observe the preview list.

[Expected results]:

• The preview list should still be visible and the progress of the imported items should be seen.

[Actual results]:

• The preview list is no longer visible.

┆Issue is synchronized with this Jira Task