Replace TestMultisigReentrant with something else

[rvagg]

Maybe?

filecoin-project/builtin-actors#1697 being included in actors v17 broke TestMultisigReentrant which exists as an integration test for call stack limits. It's being removed to get #13304 landed but we should consider whether it's necessary to replace with some alternative.

Ref: filecoin-project/builtin-actors#426
Ref: #8816