fix: removing cert-manager invalid value

[jfavellar90]

The cert-manager validations are strict so it won't accept un-supported values in the chart configuration. This PR removes the email (it is not supported in the current chart version) value from the cert-manager configuration to prevent failures in installing the Harmony chart.

[openedx-webhooks]

Thanks for the pull request, @jfavellar90!

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[gabor-boros]

@jfavellar90 & @Ian2012 The cert-manager email value was in use. https://github.com/openedx/openedx-k8s-harmony/blob/main/charts/harmony-chart/templates/issuer.yaml#L9C5-L9C54

Removing that value means that we won't be able to create let's encrypt certificates as that value is mandatory: https://cert-manager.io/docs/tutorials/acme/nginx-ingress/#step-6---configure-a-lets-encrypt-issuer

[jfavellar90]

@jfavellar90 & @Ian2012 The cert-manager email value was in use. https://github.com/openedx/openedx-k8s-harmony/blob/main/charts/harmony-chart/templates/issuer.yaml#L9C5-L9C54

Removing that value means that we won't be able to create let's encrypt certificates as that value is mandatory: https://cert-manager.io/docs/tutorials/acme/nginx-ingress/#step-6---configure-a-lets-encrypt-issuer

@gabor-boros thanks for fixing the issue