This commit reverts the change to using the cloudsql.editor role
for the backup service account from the cloudsql.admin role. This was
introduced in https://github.com/terraform-google-modules/terraform-google-sql-db/pull/597 but due to this the deletion of old backups on the
instance now receives a 403 error in the workflow. This is due to the
fact that the cloudsql.editor role lacks the cloudsql.backupRuns.delete
permission.
This commit reverts the change to using the cloudsql.editor role for the backup service account from the cloudsql.admin role. This was introduced in https://github.com/terraform-google-modules/terraform-google-sql-db/pull/597 but due to this the deletion of old backups on the instance now receives a 403 error in the workflow. This is due to the fact that the cloudsql.editor role lacks the cloudsql.backupRuns.delete permission.
Closes: https://github.com/terraform-google-modules/terraform-google-sql-db/issues/617