WIP PHOENIX-5215 Migrate from HTrace to OpenTelemetry tracing#2394

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Commits on Mar 17, 2026

PHOENIX-5215 Migrate from HTrace to OpenTelemetry tracing
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Commits on Mar 18, 2026

PHOENIX-5215 Deprecate TRACE ON/OFF as no-op; remove traceSpan/traceScope from PhoenixConnection
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