Automation/reorder widgets reworking

[mpiotrowski1]

Description

I rewrote the Cypress automatic tests for reordering the widgets on board (both when logged in & logged out), because they needed a specific state of application to work. Now the test creates its own board state before testing the functonality.

I also moved that into one test, as good part of it is setting up the enviroment, and the test for reordering when logged out would only differ by a few lines (logging out itself, and the assertions) - with testing when logged in first, as it's more important, and if it doesn't work, it's likely the other part wouldn't work, either.

Motivation and Context

It removes the need to have a specific state of board/application for the automatic test to work.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• Automated functional tests have been added or modified to cover my changes (if applicable)
• I have updated the documentation accordingly.

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[szymon-owczarzak]

Nice work @mpiotrowski1 !
Two things that need improvement:

1. Please split dashboard and widget reordering tests into 2 files:
   dashboards_reordering.js and widgets_reordering.js
2. Make sure that dashboards are deleted after successful tests - AFAIS there are some leftovers after tests passed.

[mpiotrowski1]

Two things that need improvement:

1. Please split dashboard and widget reordering tests into 2 files:
   dashboards_reordering.js and widgets_reordering.js
2. Make sure that dashboards are deleted after successful tests - AFAIS there are some leftovers after tests passed.

Re: 1. Done, though I named the files "reordering_widgets.js" and "reordering_dashboards.js" respectively, so that they are grouped together, when listed alphabetically.
Re: 2. Done.