Allow custom CA for gitlab-workspaces-proxy

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Proposal

When configuring gitlab-workspaces-proxy on a self-hosted instance that uses certificates signed by an internal CA, it would be good to be able to pass the custom CA to the workspaces-proxy helm chart. Failure to do so, causes communications between the proxy and rails to fail due to certificate errors.

This is currently supported in the gitlab agent with the config.caCert option (ref)

This will be a requirement for many self-managed instances to support Remote Development Workspaces.