Issue #3529128: Run Cypress tests in the drupal-testing image

Sally Youngrequested to merge
issue/canvas-3529128:3529128-move-cypress-image into 1.x

Moves the Cypress tests to run on the drupal-testing image in preparation for removing the dependency on the upstream GitLab templates

Also adds the Cypress cache to the GitLab CI cache

Testing instructions

Tests passing

Closes #3529128

Edited by Sally Young

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