Add util function for waiting 1 min #15294

Job	Run time
terraform-provider-google-beta / generate-repository	3m 12s
terraform-google-conversion / generate-repository	1m 4s
terraform-provider-google / generate-repository	3m 24s
docs-examples / generate-repository	45s
terraform-provider-google-beta / unit-test-terraform-provider-google-beta	13m 54s
terraform-google-conversion / compile-and-unit-tests	9m 57s
terraform-provider-google / unit-test-terraform-provider-google	12m 58s
	45m 14s

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