Add more examples and tests for run criteria

[alice-i-cecile]

Currently there are no examples and limited tests for these.

We should add both.

[hymm]

There's some tests here: https://github.com/bevyengine/bevy/blob/6615b7bf6439c9bcaf59982b2713e1c1564bf0f5/crates/bevy_ecs/src/schedule/stage.rs#L1432-L1562

[james7132]

#7652 adds an example for run conditions, and though it seems like the tests that @hymm are no longer there after stageless's merge. Perhaps we should add those tests back in.

[LiamGallagher737]

I'm happy to add in some more tests, would theses go the conditions.rs file? https://github.com/bevyengine/bevy/blob/main/crates/bevy_ecs/src/schedule/condition.rs

[alice-i-cecile]

Yes please, I would add a mod tests there.