Service account doesn't get RoleBinding assigned when it's given a custom name

[calvo2024]

The values.yaml file allows users to specify a custom name for TFE service account: https://github.com/hashicorp/terraform-enterprise-helm/blob/main/values.yaml#L23

However, the RoleBinding resource is configured to have the role assigned to a service account with the default name, i.e. the Namespace's name: https://github.com/hashicorp/terraform-enterprise-helm/blob/main/templates/rbac.yaml#L58

This creates authorization errors when the service account is given a name different than the namespace's name.