Steps to implement:
Copy over and adapt setup files, to install Cypress in the Cite code base.
Port tests/selenium/specs/backlinks.js and supporting file cite.page.js to run under the Cypress environment, in a second patchset.
Run the new suite in CI, replacing the previous selenium integration.
Delete the selenium test suite.
Bug: T353436
Change-Id: Ie76371e18d8612daa7c7be741432c6f3e0b783b5
