Add missing where, name and order keywords into schema

[bajertom]

Pull Request Checklist

• implement the feature
• modify the json schema

Fixes issue #2984 and #3008.
Regarding #3008 - where (and order and name) is present in all other prepare schemas (except errata). Not sure whether to include it in this one as well?

[happz]

Regarding #3008 - where (and order and name) is present in all other prepare schemas (except errata).

where should be also accepted by all prepare plugins, including errata.

Not sure whether to include it in this one as well?

I'd go for it, you can include where in the subject, yet another key that should be accepted, it's just nobody pointed it out in the issues.

[bajertom]

I've included where, name and order into errata and feature schemas. In shell and ansible schemas it is included via reference to common.yaml schema.

[bajertom]

/packit test

[bajertom]

Extended unit tests failing due to change in dnf stdout x stderr, fixed here #3227.

[psss]

Thanks!