feat: Inject vector aggregator address into config as env

[labrenbe]

Description

Inject the vector aggregator address into the vector config file in vector containers using environment variables. This removes the need to resolve the vector aggregator discovery ConfigMap during reconciliation.

Tested the change locally with a logging integration test.

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Author

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1. Changes are OpenShift compatible
2. CRD changes approved
3. Integration tests passed (for non trivial changes)

Reviewer

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1. Code contains useful comments
2. Documentation added or updated
3. Changelog updated
4. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
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[siegfriedweber]

nit:

Suggested change

	/// pod_builder.add_container(product_logging::framework::vector_container(
	/// &resolved_product_image,
	/// "config",
	/// "log",
	/// logging.containers.get(&Container::Vector),
	/// resources,
	/// vector_aggregator_config_map_name,
	/// ).unwrap());
	/// pod_builder.add_container(product_logging::framework::vector_container(
	/// &resolved_product_image,
	/// "config",
	/// "log",
	/// logging.containers.get(&Container::Vector),
	/// resources,
	/// vector_aggregator_config_map_name,
	/// ).unwrap());