S2U-26 Gradebook add support for group instances

[bgarciaentornos]

Creating as a draft, as I guess this is a big piece and will generate debate.

Linking the original s2u-22x PR and copying some of the comments I added in there:

#12127

Some context about parameter duplication: previously gradebook instances were linked to a site id, so every method and query regarding permissions, objects or whatever could use the same value. Splitting that between site for permissions and group for gb instance was the hardest bit, deciding where would fit one value or the other on each of the dozens of methods and hundreds of calls.

The scope of this development was limited to providing group support to the gradebook tool, but we're already in talks to follow this work for external integrations (assignments, samigo, content-review, webservices, lti...). For that reason we created this different jira:
https://sakaiproject.atlassian.net/browse/SAK-49493

The comments about using the same parameter twice is to keep those integrations working as before (gradebook site instances), while moving the code closer to the future version. Gradebookng has lots and lots of similar methods receiving different arguments, called from many different places and doing similar things but not always the same. That was hard to read and to maintain, so I tried to leave it ready so whoever gets other pieces of work doesn't have to go through that process again.

[bgarciaentornos]

Fix for cypress tests -> sakaicontrib/cypress-sakai#4

[bgarciaentornos]

This work has been carried on under different branches, but final contribution might be done under SAK-49493 if it's preferred that way.

As this comes from a request by his university, @jesusmmp has been following closely the development and also @ern has been informed about the progress, so it can be contributed for 25x.