Change the regex to match the providerID used by Fargate on EKS.

[dggondol]

EKS now supports pods running on Fargate. The providerID has a different format:

"aws:///eu-west-1b/120328e333-369fe1b7ba8b4416ab87216be91dc4f1/fargate-ip-192-168-159-181.eu-west-1.compute.internal"

I just adapted the regex to match both patterns. Without this, the autoscaler will not work if you have one node (one pod) running on Fargate.

Issue: #2637

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[Jeffwan]

@dggondol Could you sign CLA first?

[Jeffwan]

/lgtm
/approve

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