Implement `koji_build` trigger for `koji_build` job

[nforro]

TODO:

• [x] start listening to org.fedoraproject.prod.buildsys.tag events
• [x] implement koji_build trigger:
  • check if the event's tag matches a sidetag in the sidetags table
  • if it does, get list of packages tagged into the sidetag (koji list-tagged $SIDETAG)
  • for every package/project get Packit config and find any jobs with koji_build trigger and sidetag_group matching the sidetag (if this proves impractical, we can resort to having a global configuration for all packages sharing a sidetag)
  • for every job found check if their tagged_packages are a subset of packages tagged into the sidetag
  • if yes, trigger the build (from the HEAD commit of the corresponding dist-git branch)

[nforro]

Here is an example org.fedoraproject.prod.buildsys.tag payload:

{
  "body": {
    "base_url": "https://koji.fedoraproject.org",
    "build_id": 2424213,
    "instance": "primary",
    "name": "python-smart_open",
    "owner": "music",
    "release": "1.fc40",
    "tag": "f40-build-side-85541",
    "tag_id": 85541,
    "user": "music",
    "version": "7.0.3"
  },
  "headers": {
    "fedora_messaging_rpm_python-smart_open": true,
    "fedora_messaging_schema": "koji_fedoramessaging.tag.TagV1",
    "fedora_messaging_severity": 10,
    "fedora_messaging_user_music": true,
    "priority": 2,
    "sent-at": "2024-03-21T15:17:43+00:00"
  },
  "id": "57d89d96-8eac-4f9f-b787-053cd2532305",
  "queue": null,
  "topic": "org.fedoraproject.prod.buildsys.tag"
}