Refactor cluster.PackageSecretNeedsWait

[mkcp]

Describe what should be investigated or refactored

While extracting named returns for #2979 we ran into a method on pkg/cluster/Cluster that had grown a bit unruly (See discussion below). At the moment it doesn't make sense to remove the named returns because they're the most effective documentation for the values themselves. @AustinAbro321 suggested renaming the function to GetWebHookWait - and there's likely a way to simplify the return values and/or provide a wrapper struct to help describe the return values. There's some downstream consumers of the function that could be simplified as well.

Links to any relevant code

(optional) i.e. - https://github.com/zarf-dev/zarf/blob/main/README.md?plain=1#L1