template: ask for backup/restore considerations

[maiqueb]

We have designed features without any regard for backup/restore of the cluster, and it shows.

For instance, the primary UDN impacted API is not idempotent: if we provision the namespaces and workloads first, and only then the NADs / UDNs, the network topology will look totally different, which might give the user something other than what they desired in the first place.

[maiqueb]

@dhellmann

Not sure this deserves a specific section, or if a highlighted sentence in the Implementation details would be enough.

Thoughts ?

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[maiqueb]

/remove-lifecycle stale

[maiqueb]

@dhellmann ping ... could you take a look ?

@JoelSpeed / @bparees I see you've updated the template in the past ... What do you think of this change ?