Refactor createPbTraceContextFromSpan to use createTraceparent helper

[Copilot]

Addresses feedback from #97 to eliminate duplicate traceparent formatting logic.

Changes

• Refactored createPbTraceContextFromSpan to call createTraceparent() instead of manually formatting the traceparent string
• Removes duplicate flags formatting and template literal construction
• Ensures consistent ID normalization (lowercase) and validation across all traceparent creation

// Before: Manual formatting duplicates logic
const flags = (spanContext.traceFlags & 0xff).toString(16).padStart(2, "0");
const traceparent = `00-${spanContext.traceId}-${spanContext.spanId}-${flags}`;

// After: Reuses existing helper
const traceparent = createTraceparent(spanContext.traceId, spanContext.spanId, spanContext.traceFlags);

This ensures future changes to traceparent formatting apply consistently across the codebase.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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