Switch external-dns back to official upstream

[ytsarev]

Fixes #1744

This one needs extensive testing with various edge DNS environments.

The initial local test with rfc2136 is successful.

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HOW TO RUN CI

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Heavy tests

Add the heavy-tests label on this PR if you want full-blown tests that include more than 2-cluster scenarios.

Debug tests

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[abaguas]

As commented on slack: https://cloud-native.slack.com/archives/C021P656HGB/p1730555833483909?thread_ts=1729982761.336259&cid=C021P656HGB

Version 0.15.0 can't create NS records. ThenewRecordSet function would need to be adapted: https://github.com/kubernetes-sigs/external-dns/blob/master/provider/azure/azure.go#L339

This is the error that we see:

time="2024-11-02T13:52:30Z" level=info msg="Updating NS record named 'cloud' to 'gslb-ns-eu-cloud.k8gb.io;gslb-ns-us-cloud.k8gb.io' for Azure DNS zone 'k8gb.io'."
time="2024-11-02T13:52:30Z" level=error msg="Failed to update NS record named 'cloud' to 'gslb-ns-eu-cloud.k8gb.io;gslb-ns-us-cloud.k8gb.io' for DNS zone 'k8gb.io': unsupported record type 'NS'"