Fix google dns for records with multiple targets

[mikenairn]

fixes #563

Fix toResourceRecordSets in google dns provider to make sure that only a single record set is created for each unique dnsName. Issue was introduced here
c57366e#diff-eea59a6fb9851390f6210a03f57ba88ea1628c32d20d526998600135a1642bedR494

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maleck13, mikenairn

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[maleck13]

/lgtm

[david-martin]

Fix verified in local cluster.
Logs show a single record for the weighted round robin records being created.
No 409 conflict.

2023-09-19T15:49:01Z	DEBUG	google-dns	Change zone	{"project": "it-cloud-gcp-rd-midd-san", "zone": "davmarti-google-hcpapps-net", "batch": 0}
2023-09-19T15:49:01Z	DEBUG	google-dns	Add records	{"project": "it-cloud-gcp-rd-midd-san", "name": "2c71gf.lb-4ej5le.myapp11.davmarti.google.hcpapps.net.", "type": "A", "Rrdatas": ["172.31.200.0"], "RoutingPolicy": null, "ttl": 60}
2023-09-19T15:49:01Z	DEBUG	google-dns	Add records	{"project": "it-cloud-gcp-rd-midd-san", "name": "default.lb-4ej5le.myapp11.davmarti.google.hcpapps.net.", "type": "CNAME", "Rrdatas": [], "RoutingPolicy": {"wrr":{"items":[{"rrdatas":["2c71gf.lb-4ej5le.myapp11.davmarti.google.hcpapps.net."],"weight":120},{"rrdatas":["lrnse3.lb-4ej5le.myapp11.davmarti.google.hcpapps.net."],"weight":120}]}}, "ttl": 60}
2023-09-19T15:49:01Z	DEBUG	google-dns	Add records	{"project": "it-cloud-gcp-rd-midd-san", "name": "lb-4ej5le.myapp11.davmarti.google.hcpapps.net.", "type": "CNAME", "Rrdatas": [], "RoutingPolicy": {"geo":{"items":[{"location":"europe-west1","rrdatas":["default.lb-4ej5le.myapp11.davmarti.google.hcpapps.net."]}]}}, "ttl": 300}
2023-09-19T15:49:01Z	DEBUG	google-dns	Add records	{"project": "it-cloud-gcp-rd-midd-san", "name": "lrnse3.lb-4ej5le.myapp11.davmarti.google.hcpapps.net.", "type": "A", "Rrdatas": ["172.31.201.0"], "RoutingPolicy": null, "ttl": 60}
2023-09-19T15:49:01Z	DEBUG	google-dns	Add records	{"project": "it-cloud-gcp-rd-midd-san", "name": "myapp11.davmarti.google.hcpapps.net.", "type": "CNAME", "Rrdatas": ["lb-4ej5le.myapp11.davmarti.google.hcpapps.net."], "RoutingPolicy": null, "ttl": 300}