Do not emit ssh public key removal logs when using ssh private key file

[ralbertazzi]

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Description

I'm using this Packer plugin with OS Login and a user-specified private key file. The plugin logs correctly report that an SSH key has been imported, but they mistakenly report at the end of the build that the key has been deleted. These logs confused me and, while I believe that no key has been deleted (I can in fact still see the key through gcloud compute os-login describe-profile and I successfully managed to launch multiple consecutive builds with the same key), I would like for the logs not to be emitted at all to avoid confusion.

Interesting configuration

ssh_private_key_file = "/path/to/private/key"
ssh_username = "sa-username"
use_os_login = true

When this configuration is used, these logs should not be emitted:

2023-05-05T16:25:04Z: ==> googlecompute.cos_image: Deleting SSH public key for OSLogin...
2023-05-05T16:25:04Z:     googlecompute.cos_image: SSH public key for OSLogin has been deleted!