Not all cookies require consent. There are many legitimate reasons to collect personal data - consent is only required if you cannot find another legitimate reason.

For cookies that mean: technical cookies that you need to technical provide your offering (think of authentication session cookie, loadbalancer sticky session cookies, but also cookies to understand if someone opted into tracking) can be set with legitimate interest and do not require a consent.

A consent under GDPR is strictly opt-in. This means, by default you must not track a user (EU citizen) that just landed on your site. After consent, you can load your GA plugin.