* feat: [BD-26] add the is_proctored value to SequenceMetadata API

* feat: add temporary flag for enabling/disabling proctored exams

* fix: change creation date

* fix: fix text indents

* fix: [BD-26] Remove redundant duplicated test.

Co-authored-by: Sagirov Eugeniy <sagirov19@gmail.com>
Co-authored-by: Igor Degtiarov <igor.degtiarov@raccoongang.com>