Allow disabling cert-generator with a Helm value

[hafe]

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Is your enhancement request related to a problem? Please describe. Since it is not recommended to use the cert-generator in a production environment it should be possible to disable it when installing. Preferably and even better, disabled by default.

Even if e.g cert-manager is used to generate a cert, there is a potential race when installing the chart. If cert-manager has not generated secrets yet, the cert-generator will kick in and do it and you still have self signed certs when not intended.

What would you like to be added:

A boolean value to disable everything related to the cert-generator.

Why this is needed: See above

Additional context Add any other context or screenshots about the enhancement request here.