[telemetrygen] Fix case where CA is intentionally unset to derive from host CA pool #31249
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Description:
The introduction of TLS configuration broke cases where an individual wants to use the default root CAs provided by the host environment. This adds that functionality back by saying that if a CA file is provided, we will adjust the root CA pool, but not otherwise.
Link to tracking Issue: 31191
Testing: Run telemetrygen against metrics, traces, logs http and grpc endpoints. Test by explicitly providing the root CA cert and not.
Documentation: