Introduce auto generated screenshots in rule-based uploader

[OlegZharkov]

Replace screenshots by images produced by selenium in https://github.com/galaxyproject/ci-testing
The corresponding selenium tests are marked in galaxyproject/galaxy#11171 and galaxyproject/galaxy#10911

Please deploy locally and assure that all screenshots are correct.

[hexylena]

Hey @OlegZharkov super exciting! Would you mind reverting your changes to the Gemfile and Gemfile.lock please

[OlegZharkov]

Hey @OlegZharkov super exciting! Would you mind reverting your changes to the Gemfile and Gemfile.lock please

I actually did, it's a Github Bug. I did force push my changes, here's new diff

However it's not updating this PR. Do I really have to create a new PR?

[hexylena]

Looks like a caching issue and the cache has already expired, the diff looked incorrect the first time I opened it, and correct just now.

[hexylena]

But you've already opened a new one so we can move discussion there.

[OlegZharkov]

Looks like a caching issue and the cache has already expired, the diff looked incorrect the first time I opened it, and correct just now.

definitely not a browser cache. I tried to open in incognito, didn't help.
I wanted to close-reopen this PR and it didn't allow me to re-open because it was forced-pushed... so yeah, I kinda had to open the new one