Add tests for instant results feature

[MARQAS]

Description of the Change

This PR adds the cypress test for the Instant results feature.

Closes #

Alternate Designs

Possible Drawbacks

Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

Added: Test for instant results feature.

Credits

Props @MARQAS

[felipeelia]

@MARQAS, having in mind that we don't need small atomic tests we can merge all the following tests in just one:

Can see instant results list
Can display the number of results
Can show the modal in the same state after a reload
Can update the results after changing the search term

I am not 100% sure about the reason why it is failing on EP.io but it is probably a timeout. Can you try capturing the AJAX request and waiting for it to be completed before checking if "Blog" is visible?