Behat test cases enhancement

[sabina-talipova]

Description

We should update the profile.feature behat test cases with the following updates:

• Date/time format - Difficult because its not exposed anywhere in the CMS?
• Group modification as ADMIN user

See:

silverstripe-admin/tests/behat/features/profile.feature

Lines 69 to 70 in 0f18b3d

	# TODO Date/time format - Difficult because its not exposed anywhere in the CMS?
	# TODO Group modification as ADMIN user