Add check for cycles in dependency trees to debug-data CLI

[adrianeboyd]

Feature description

The debug-data CLI should also check for cycles in dependency trees.

Cycles should be identified elsewhere, too, to prevent the kind of error from #4083, but a check in debug-data would also be helpful.

[adrianeboyd]

Wait, I already get the ValueError [E069] from GoldCorpus when the corpus is loaded, so maybe it is just a matter of reporting that more cleanly.

[ines]

Yes, that's a good idea! It might also be nice to test the debug-data a bit more thoroughly to make sure it really works as expected – and then I can document it properly 🙂 (It's currently still considered experimental and thus undocumented – but it has held up really well and people who've tried it found it very useful.)

[lock]

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