Remove sidebar mini header.

Open Jacob Schatz requested to merge tree-panel-header into master

What does this MR do?

Removes the tree panel header for now. Until we have new file and folder.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

See #38363

Edited by username-removed-892863