dApp - extend end-to-end tests to verify service worker detects cache corruption

[weilbith]

Description

Follow up of #2837
The issue in #2869 was that I wasn't able to do it. To not block the work, I decided to split it and wait for @taleldayekh his help. I'm not familiar enough with Cypress its asynchronous functionality which is quite awkward. Though I added the test instructions to the very end of the scenario, it run them right at start. This makes the whole tests not work as this manipulates the cache...

Acceptance criteria

Tasks

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[weilbith]

I now understood how it works. 😬
I think a custom task should do the job here...