Migrate to org.fedoraproject.prod.pagure.git.receive

[lbarcziova]

Currently used org.fedoraproject.prod.git.receive will be removed as it is triggered by the same action.

CC @abompard

[lbarcziova]

Work in progress:
#2303
packit/packit-service-fedmsg#100
mfocko/deployment#1

TODO:

• add information about changed files to the payload of the new topic's message in Pagure code
• adjust the packit PRs to the change

[nforro]

I've opened https://pagure.io/pagure/pull-request/5435.

[nforro]

Updated Pagure has been deployed, example org.fedoraproject.prod.pagure.git.receive payload:
https://apps.fedoraproject.org/datagrepper/v2/id?id=d98e4f3f-2e6a-4634-b86b-8abbae9c54d3&is_raw=true&size=extra-large