Add Canonical Hosted Zone IDs for ELB/NLB in eu-south-2 (Spain) AWS region

[baziliolg]

AWS Spain (eu-south-2) region is not yet fully supported by external-dns, which results in the following warning messages from the latest-version external-dns Pod:

level=warning msg="Could not find canonical hosted zone for domain REDACTED.eu-south-2.elb.amazonaws.com. This may be because your region is not supported yet."

Annotation external-dns.alpha.kubernetes.io/aws-target-hosted-zone does nothing (or maybe it's me, as I'm not sure which k8s entity the annotation should be added to; I've tried all entitied related to external-dns as well as my Ingresses), the DNS records still are not created:

level=error msg="Failed submitting change (error: InvalidChangeBatch: [RRSet of type TXT with DNS name prometheus.dev.example.com. is not permitted because a conflicting RRSet of type CNAME with the same DNS name already exists in zone dev.example.com.]\n\tstatus code: 400, request id: REDACTED), it will be retried in a separate change batch in the next iteration"

I've tried limiting batch size to 1 or 2, but this did not resolve the issue.

As soon as I built own external-dns Docker image with known ELB Canonical Hosted Zone ID for eu-south-2 added to the code, external-dns created DNS records successfully, no warnings, no errors.

No Issue is filed for this problem yet.

Checklist

• Unit tests updated - no need
• End user documentation updated - no need

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: baziliolg / name: Maksym Pylypenko (65b1fd7)

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[johngmyers]

Verified against https://docs.aws.amazon.com/general/latest/gr/elb.html
/lgtm

[johngmyers]

/assign raffo

[szuecs]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

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