fix(iaas): wait for network area deletion until projects are deleted#978

marceljk merged 2 commits intomainstackitcloud/terraform-provider-stackit:mainfrom

fix/STACKITTPR-287-error-deleting-network-area-due-to-attached-projectstackitcloud/terraform-provider-stackit:fix/STACKITTPR-287-error-deleting-network-area-due-to-attached-projectCopy head branch name to clipboard