REVIEW-ONLY-PR: add user-profile admin-ui test to realm_settings_user_profile_enabled_spec.ts

[danielFesenmeyer]

add test named "Checks that attribute with select-annotation is displayed and editable when user is created/edited"

• refactor existing tests to use page objects, add new helper methods to page objects and use it in existing tests
• rename CreateUserPage#save() to #create(), and add a new method #update()
• add new test mentioned above
• re-enable test "Checks that required attribute with permissions to view/edit is present and required when user is created"
• stabilize realm_settings_user_profile_enabled.spec.ts by resetting the user-profile to default and resetting the realm attributes to default before each test