fix federation with kroeg

kroeg sends actors as objects instead of IDs, which was previously supported (for hubzilla compat) but broke somehow. add a test for that.

kroeg also sends to/cc lists as strings instead of single-element lists, because the activitypub protocol allows this. litepub does not allow this, so we just convert those cases to a list. the same test covers that too.

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• b8560e5e - testsuite: formatting

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• 80584436 - testsuite: add puckipedia test fixture

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enabled an automatic merge when the pipeline for 80584436 succeeds

merged

mentioned in commit 5fbb14f5