OtelTraceContextBuilder throwing Exception

[eceolinupgrade]

The TraceContext interface accepts nullable values on sampled flag.

The problem is if you do not set that value you'll get NPE because of the ternary condition on the .build() method.

@Override
    public TraceContext build() {
        if (StringUtils.isNotEmpty(this.parentId)) {
            return new OtelTraceContext(
                    SpanContext.createFromRemoteParent(this.traceId, this.spanId,
                            this.sampled ? TraceFlags.getSampled() : TraceFlags.getDefault(), TraceState.getDefault()),
                    null);
        }
        return new OtelTraceContext(
                SpanContext.create(this.traceId, this.spanId,
                        this.sampled ? TraceFlags.getSampled() : TraceFlags.getDefault(), TraceState.getDefault()),
                null);
    }

[binig]

just offered a simple fix for this #910