[BB-3585] Add initial setup for e2e tests

Created by: arjunsinghy96

This adds the base for e2e test in OCIM with react frontend

JIRA Tickets: BB-3585

Testing Instruction

1. Checkout to this branch
2. Run vagrant up and vagrant ssh to checkin into the devstack.
3. Run make requirements
4. Run ./bin/install-supported-firefox
5. Run make test.e2e
6. Test that the frontend is build and e2e tests are run and passing.
7. Check that the Circle CI build e2e-tests is passing.

Author Notes

1. selenium and firefox need to be updated to 3.141.0(added in requirements) and 85+ (updated in ./bin/install-supported-firefox) respectively
2. We have registration.tests.utils.BrowserTestMixin using selenium but I could not find its use anywhere.