This is hopefully the final part of PR #4767, rebased and squashed.
More thorough federation tests are at https://code.forgejo.org/forgejo/end-to-end/pulls/1276 but the mock has been extended to hopefully cover a good chunk as well.
Co-authored-by: Gergely Nagy <forgejo@gergo.csillger.hu>
Co-authored-by: Michael Jerger <michael.jerger@meissa-gmbh.de>
Co-authored-by: zam <mirco.zachmann@meissa.de>
Co-authored-by: Panagiotis "Ivory" Vasilopoulos <git@n0toose.net>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10380
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>
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