[TASK] Fetch folder and environment status through AJAX

Resolves: #57166
Releases: 6.2
Change-Id: I72aa55cff3322bbe46d271758fd04f3aba860ae7
Reviewed-on: https://review.typo3.org/28619
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn