bug: new wait strategy with flux
# Bug
## Description
Describe the problem, what were you doing when you noticed the bug?
The wait strategy changed with flux, umbrella now waits for full reconciliation of all downstream packages and will try to roll back if any of them fail. This is a significant breaking change that we should avoid unless that decision is made deliberately. We should revert back to [the `legacy` wait strategy](https://fluxcd.io/flux/components/helm/helmreleases/#wait-strategy).
## BigBang Version
What version of BigBang were you running?
Needs to go out with the flux change in 3.25.0
issue