feat: support Cloud SQL\'s new field `psc_auto_connections`. (#12236) #1

Job	Run time
terraform-google-conversion / generate-repository	1m 24s
terraform-provider-google-beta / generate-repository	3m 42s
terraform-provider-google / generate-repository	3m 42s
docs-examples / generate-repository	1m 9s
terraform-google-conversion / compile-and-unit-tests	8m 12s
terraform-provider-google-beta / unit-test-terraform-provider-google-beta	10m 26s
terraform-provider-google / unit-test-terraform-provider-google	9m 45s
	38m 20s

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