WL-124 added the jasmine tests for the autoenrollment csv

Added bokchoy tests and assets (csv files) for CSV auto reg and enrollment.
Set the env flag "ALLOW_AUTOMATED_SIGNUPS": true in bok_choy.env.json

Resolved quality issues.

resolved cherry pick conflicts

Improved bokchoy tests as per code review suggestions.

added the BDD in the docstrings for all the test scenarios

changed the bok choy test string

Improved bokchoy tests as per further code review suggestions.

Made a MembershipPageAutoEnrollSection a separate PageObject.
Merge pull request #5969 from edx/muhhshoaib/WL-124-front-end-tests-for-auto-enrollment

muhhshoaib/wl 124 add front end tests for autoenrollment