RF_13.001.005 | [Teacher]My_announcement > Verify the ability to hide the ad from students

[matveyvolodin]

TC_13.001.005 | [Teacher]My_announcement > Verify the ability to hide the ad from students
Refactored test:
test_announcement.py::test_teacher_hiding_announcement

Deleeted methods:
announcement.py::check_button_text_visible(self):
announcement.py::check_button_text_invisible(self):

Methods were deleted because of irrelevance

Also:
Added credential variables for my tests