feat: support Cloud SQL's new field `server_ca_mode`. (#11331) #1454

Job	Run time
docs-examples / generate-repository	1m 19s
terraform-google-conversion / generate-repository	1m 49s
terraform-provider-google / generate-repository	5m 6s
terraform-provider-google-beta / generate-repository	4m 12s
terraform-google-conversion / compile-and-unit-tests	7m 51s
terraform-provider-google-beta / unit-test-terraform-provider-google-beta	9m 27s
terraform-provider-google / unit-test-terraform-provider-google	8m 53s
	38m 37s

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