test(ll): make cypress tests compatible with deployed environments

[y3rsh]

Overview

Labware Library Cypress tests were able to run locally and in CI but some patterns did not allow for the same test to execute against a deployed environment. Additionally there were no instructions or make targets to quickly run the tests against a deployed environment.

Test Plan and Hands on Testing

• all the specs work in the Cypress GUI and through make for me locally
• reviewer checkout this branch and make -C labware-library test-e2e-remote REMOTE_BASE_URL='https://labware.opentrons.com'
• CI works. The success of the labware library e2e tests job in Labware Library test, build, and deploy proves the tests also still works against localhost

Review requests

• normal review of code
• run locally for yourself to validate and tick the box 😊

Risk assessment

• None, test only

[y3rsh]

There might be an issue where the tests are not working in CI???
Will have to figure that out. make test-e2e is working locally for me.

Fixed. Removed the mock and replaced with real file read.