machine: Remove .ssh/authorized_keys workaround for MCO bug

https://bugzilla.redhat.com/show_bug.cgi?id=1956739 was a MCO bug which was
mistakenly changing ~/.ssh/authorized_keys ownership to root.root. This bug was
fixed in OpenShift 4.10 so we no longer need to write as root to this file.
This will avoid the need for a workaround in podman bundle creation
which creates an empty ~/.ssh/authorized_keys with the right owner as
otherwise the file that gets created is owned by root.root.

This makes use of the newly introduced ssh.CopyData()

This is related to crc-org/snc@948ce966

pkg/crc/machine/start.go

@@ -626,9 +626,7 @@ func updateSSHKeyPair(sshRunner *crcssh.Runner) error {
 	}
 
 	logging.Info("Updating authorized keys...")
-	// CopyData uses sudo and we need to use it
-	// because of https://bugzilla.redhat.com/show_bug.cgi?id=1956739
-	err = sshRunner.CopyDataPrivileged(publicKey, "/home/core/.ssh/authorized_keys", 0644)
+	err = sshRunner.CopyData(publicKey, "/home/core/.ssh/authorized_keys", 0644)
 	if err != nil {
 		return err
 	}