Provisioning: describe which folder caused an error while provisioning from files structure (#26771)

* Provisioning: describe which folder caused an error while provisioning from files structure

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

* Apply suggestions from code review

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

* Remove unused DashType constants

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>