fix: fix non-determinism in voting power rotation

There is a non-determinism bug in voting power rotation, where we iterate over the activeBTCDels map, which is not deterministic. This PR fixes the bug by first sorting the keys before iterating over them.

Reproduce: https://github.com/babylonchain/babylon/tree/3d4b194e020aea069c372b33528a4d12f6e88c1f
Fix and fuzz test: https://github.com/babylonchain/babylon/tree/ed65719b9d1825a3eb1992b56e2c8d8eecc74957

babylonchain / babylon

fix: fix non-determinism in voting power rotation #597