Bug: Nested one item accordion

[Daniel-Warner-X]

🐛 Bug Description

There is an accordion in the left sidebar of the session chat that says 'Experimental'. In that accordion is one item 'File explorer' which itself is an accordion.

Move 'File Explorer' out of the accordion and mark it 'experimental' with a badge or description text.

[Gkrumbach07]

Tracked in Jira: https://issues.redhat.com/browse/RHOAIENG-39116

[Daniel-Warner-X]

Fixed in this PR: #295