Tests: Add a test that worlds can create filler without generation steps

[alwaysintreble]

What is this fixing or adding?

Item Link filler replacement creates a new world and then creates filler with that world, if that new world can't actually create filler, generation will crash so this is a test for that.

How was this tested?

📄 ✍️

[Berserker66]

This will need to check that the world even has items defined, so it doesn't fail on bk sudoku

[Berserker66]

@espeon65536 for OoT and @lordlou for SMZ3
PoryGone said it will be fixed in the next SA2 update, which is unfortunate as I'd prefer it fixed in this AP update.

[kindasneaki]

I’m surprised RoR2 isn’t failing as it doesn’t have get_filler_item_name. Either way I’ll try to get it added as soon as I can

[el-u]

I’m surprised RoR2 isn’t failing as it doesn’t have get_filler_item_name. Either way I’ll try to get it added as soon as I can

If you don't have get_filler_item_name you get to pass this particular test by for free because the default implementation can be called without generation steps (as long as the world defines at least one item).

But you'll fail #1172.

[alwaysintreble]

Closing this as #2081 does the same thing but tests more things at the same time.