Additional fixes for RPM triggers for upload jobs

[cottsay]

It turns out that the format of the sync-to-testing job names is even more complicated than what was constructed here, so we were still adding incorrect job names there. The previous update to this function didn't regress that, but it also didn't fix it.

It turns out that there are functions to just do the formatting for us, so we should just use that.

Follow-up to #1052

Here's the diff, note that rhel_ now appears in the RHEL job names.

Skipped 'upload_main' because the config is the same (dry run)
Updating job 'upload_testing' (dry run)
    <<<
    --- remote config
    +++ new config
    @@ -26 +26 @@
    -      <upstreamProjects>Hrel_sync-packages-to-testing_8_x86_64,Hrel_sync-packages-to-testing_jammy_amd64,Hrel_sync-packages-to-testing_jammy_arm64,Irel_sync-packages-to-testing_9_x86_64,Irel_sync-packages-to-testing_jammy_amd64,Irel_sync-packages-to-testing_jammy_arm64,Jrel_sync-packages-to-testing_9_x86_64,Jrel_sync-packages-to-testing_noble_amd64,Jrel_sync-packages-to-testing_noble_arm64,Rrel_sync-packages-to-testing_9_x86_64,Rrel_sync-packages-to-testing_noble_amd64,Rrel_sync-packages-to-testing_noble_arm64,import_upstream,import_upstream_rpm</upstreamProjects>
    +      <upstreamProjects>Hrel_sync-packages-to-testing_jammy_amd64,Hrel_sync-packages-to-testing_jammy_arm64,Hrel_sync-packages-to-testing_rhel_8_x86_64,Irel_sync-packages-to-testing_jammy_amd64,Irel_sync-packages-to-testing_jammy_arm64,Irel_sync-packages-to-testing_rhel_9_x86_64,Jrel_sync-packages-to-testing_noble_amd64,Jrel_sync-packages-to-testing_noble_arm64,Jrel_sync-packages-to-testing_rhel_9_x86_64,Rrel_sync-packages-to-testing_noble_amd64,Rrel_sync-packages-to-testing_noble_arm64,Rrel_sync-packages-to-testing_rhel_9_x86_64,import_upstream,import_upstream_rpm</upstreamProjects>
    >>>

[cottsay]

This has been deployed.