* fix: delete folders using postorder
* chore: use helper function and do not add method to Folder store
- addresses other review comments fixing log messages and cleans up the unit tests
* chore: run library element tests on modes 2,3,5 only
* chore: adjust to folder.SortByPostorder(folders []*Folder)
* chore: run library panels tests in mode 2,3,5 only
* chore: run tests in all modes and increase timeout
- adjusting the modes and tweaking configs will be done separately
e69f3c55f7