Fix httpclient-4.x plugin injecting sw8 headers into excluded ports (#800)
Add PROPAGATION_EXCLUDE_PORTS config to httpclient-4.x plugin, mirroring the existing httpclient-5.x feature. When configured, requests to listed ports skip span creation and header injection entirely, preventing HTTP 400 from servers like ClickHouse that reject unknown headers.
Default is empty (opt-in). The ClickHouse E2E test sets it to 8123 explicitly.
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