Operator should auto-renew TLS certs

[sync-by-unito[bot]]

In our current state, when a user deploys Pixie, the operator generates TLS certs that are valid for 1 year. However, after the year is over, the TLS certs will expire and the user will need to redeploy Pixie in order to regenerate them.

We can now use the operator to automatically renew the TLS certs when they are close to expiration. This may be through our manual cert process, or using certmanager.

┆Issue is synchronized with this Jira Story by Unito