fix: use tutor variables to expose clickhouse container ports in k8s

[pomegranited]

Description

Updates the k8s configuration to use Tutor variables when exposing the Clickhouse container ports.

Related information

Closes #387

[openedx-webhooks]

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[pomegranited]

Note: the default values for these variables differ from what was hardcoded here, so operators may need to update their configurations.

The default values are:

• CLICKHOUSE_HOST_INSECURE_HTTP_PORT: 8123 (unchanged)
• CLICKHOUSE_HOST_INSECURE_NATIVE_PORT: 9006
• CLICKHOUSE_HOST_TLS_NATIVE_PORT: 9440

[pomegranited]

Thanks for your 👍 @Ian2012 -- do you have any concerns about the port changes here, since you guys are running Aspects in production?

[Ian2012]

We are running Aspects with Clickhouse outside the cluster. I think it's safe to make the change

[openedx-webhooks]

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