Run automated ActivityPub test suites

[mayel]

Some possible automated test suites:

• implement bonfire integration for funfedi.dev #822 and https://verify.funfedi.dev/ (integration in progress)
• https://socialweb.coop/activitypub-testing/announcement/ (fixed outbox must use OrderedCollection and made note of add AP liked collection to actors #871 add AP shares collection #872)
• https://codeberg.org/helge/fediverse-features (WIP: https://codeberg.org/bonfire/fediverse-features/src/branch/elixir-bonfire-tests)

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• https://feditest.org/ & https://github.com/fediverse-devnet/testsuite (not yet available)
• https://github.com/Letterbook/Sandcastles (a way to run several fedi apps side-by-side, but not in itself a test suite)
• https://aptestsuite.stevebate.dev/ (seems like a checklist, not a test suite)
• https://tinysubversions.com/notes/activitypub-tool/ (basic inbox test, seems to no longer work)
• https://github.com/go-fed/testsuite (offline & not maintained)
• https://test.activitypub.dev (offline)
• https://pubkit.net/ / https://mastodon.social/@dansup/112003314063840346 (not available)
• and others being discussed at https://venera.social/profile/activitypubtestsuite