And that's really the only reason to use OpenSSL for ssh keys; in general you should just use GnuPG to generate your private and public keys and distribute them to a secure place, and then use them with ssh-keygen -t rsa... and ssh-copy-id -i openssl-ssh-keypair. The reason is that ssh keys may be stored on any system; you don't want to rely on OpenSSL being available on every system.
$ ssh-keygen -t rsa -C
That will generate the public key (as a file called id_rsa in your ~/.ssh directory, with the name of the email you specify, which you'll use as the hostname in the other command. Likewise, there'll be a corresponding private key, id_rsa.pub.
If you go this route, you don't get to use your personal keypair for SSH authentication, so you'll need to generate a ~/.ssh/id_rsa file that uses your GCP project ID and store it in ~/.ssh, as shown in the article. It will have the same key in that file as you get from $ ssh-keygen -y (or $ ssh-keygen -y -f ~/.ssh/id_rsa).
But you didn't ask that, so I can't give you the answer, which is that OpenSSH can already use any OpenSSL-format privatekey and requires only ssh-keygen -y to create the OpenSSH-format publickey.
If you don't want to use the same keypair for SSH and GCP, it's easier to go the other direction -- generate the keypair and cert with openssl req -newkey -keyout -nodes..., as they show, and then use that key in OpenSSH. But you didn't ask that, so I can't give you the answer, which is that OpenSSH can already use any OpenSSL-format privatekey and requires only ssh-keygen -y to create the OpenSSH-format publickey.
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