Bug 35919: Add cypress tests

Bug 35919: Add cypress tests

This patch adds Cypress tests for the `record sources` CRUD as required
by QA.

I tried to cover all the UI interactions and behaviours.

To test:
1. Have all the patches applied
2. Run:
   $ ktd --shell
  k$ cypress run --spec t/cypress/integration/Admin/RecordSources_spec.ts
=> SUCCESS: Tests pass!
3. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>