OpenTelemetry Node Demo Improvements

[AbhiPrasad]

Problem Statement

SDK tracking issue for getsentry/opentelemetry-demo#23

Solution Brainstorm

• Add Trace Context type feat(types): Add Trace Context type #6714
• Set trace context via Otel Span instead of Sentry span fix(otel): Set trace context via Otel Span instead of Sentry span #6724
• Don't override existing baggage with OpenTelemetry Propagator fix(otel): Prevent baggage from being overwritten #6709