This commit fixes the configuration for the forthcoming Packit 1.0.0.
See [our blog post](https://packit.dev/posts/packit_1_0_0_action_required) for more details.
- Job type `build` has been changed to `copr_build`.
- Job type `production_build` has been changed to `upstream_koji_build`.
- Key `upstream_project_name` has been changed to `upstream_package_name`.
- Key `synced_files` has been changed to `files_to_sync`.
Please review and merge me before January 2025 otherwise packit-service jobs will fail because of an invalid configuration.
We got asked to ship this package also to EPEL. I already managed to create
the branches and prepare the initial builds. The last step is to enable the
downstream release automation. This commit thus enables EPELs for packit.