Consider dedup lowestNonZeroRetryAfterSeconds

[sbueringer]

During the Runtime SDK implementation we introduced a copy of lowestNonZeroRetryAfterSeconds.

Let's consider if we should deduplicate and only have this once as a util.

/kind cleanup
[One or more /area label. See https://github.com/kubernetes-sigs/cluster-api/labels?q=area for the list of labels]

[fabriziopandini]

/area runtime-sdk

[fabriziopandini]

/triage accepted
/help-wanted

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/lifecycle stale

[fabriziopandini]

/lifecycle frozen
/help

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/lifecycle frozen
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[LuBingtan]

I'd like to fix this
/assign