[pkg/ottl] Use hex.EncodeToString (#33578)

**Description:** 
Noticed a bug in the new debug logs where nil IDs (All 0s) were not
being printed correctly.

The feature hasn't been released yet, so as long as this gets merged
before the next release we dont need a changelog


**Testing:** <Describe what testing was performed and which tests were
added.>
Tested locally

pkg/ottl/contexts/internal/logging/logging.go

@@ -4,6 +4,7 @@
 package logging // import "github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl/contexts/internal/logging"
 
 import (
+	"encoding/hex"
 	"errors"
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
@@ -90,6 +91,9 @@ type Span ptrace.Span
 
 func (s Span) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
 	ss := ptrace.Span(s)
+	parentSpanID := ss.ParentSpanID()
+	spanID := ss.SpanID()
+	traceID := ss.TraceID()
 	err := encoder.AddObject("attributes", Map(ss.Attributes()))
 	encoder.AddUint32("dropped_attribute_count", ss.DroppedAttributesCount())
 	encoder.AddUint32("dropped_events_count", ss.DroppedEventsCount())
@@ -99,12 +103,12 @@ func (s Span) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
 	encoder.AddString("kind", ss.Kind().String())
 	err = errors.Join(err, encoder.AddArray("links", SpanLinkSlice(ss.Links())))
 	encoder.AddString("name", ss.Name())
-	encoder.AddString("parent_span_id", ss.ParentSpanID().String())
-	encoder.AddString("span_id", ss.SpanID().String())
+	encoder.AddString("parent_span_id", hex.EncodeToString(parentSpanID[:]))
+	encoder.AddString("span_id", hex.EncodeToString(spanID[:]))
 	encoder.AddUint64("start_time_unix_nano", uint64(ss.StartTimestamp()))
 	encoder.AddString("status.code", ss.Status().Code().String())
 	encoder.AddString("status.message", ss.Status().Message())
-	encoder.AddString("trace_id", ss.TraceID().String())
+	encoder.AddString("trace_id", hex.EncodeToString(traceID[:]))
 	encoder.AddString("trace_state", ss.TraceState().AsRaw())
 	return err
 }
@@ -146,11 +150,13 @@ type SpanLink ptrace.SpanLink
 
 func (s SpanLink) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
 	sl := ptrace.SpanLink(s)
+	spanID := sl.SpanID()
+	traceID := sl.TraceID()
 	err := encoder.AddObject("attributes", Map(sl.Attributes()))
 	encoder.AddUint32("dropped_attribute_count", sl.DroppedAttributesCount())
 	encoder.AddUint32("flags", sl.Flags())
-	encoder.AddString("span_id", sl.SpanID().String())
-	encoder.AddString("trace_id", sl.TraceID().String())
+	encoder.AddString("span_id", hex.EncodeToString(spanID[:]))
+	encoder.AddString("trace_id", hex.EncodeToString(traceID[:]))
 	encoder.AddString("trace_state", sl.TraceState().AsRaw())
 	return err
 }
@@ -368,10 +374,12 @@ type Exemplar pmetric.Exemplar
 
 func (e Exemplar) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
 	ee := pmetric.Exemplar(e)
+	spanID := ee.SpanID()
+	traceID := ee.TraceID()
 	err := encoder.AddObject("filtered_attributes", Map(ee.FilteredAttributes()))
-	encoder.AddString("span_id", ee.SpanID().String())
+	encoder.AddString("span_id", hex.EncodeToString(spanID[:]))
 	encoder.AddUint64("time_unix_nano", uint64(ee.Timestamp()))
-	encoder.AddString("trace_id", ee.TraceID().String())
+	encoder.AddString("trace_id", hex.EncodeToString(traceID[:]))
 	if ee.ValueType() == pmetric.ExemplarValueTypeInt {
 		encoder.AddInt64("value_int", ee.IntValue())
 	}

pkg/ottl/contexts/ottllog/log.go

@@ -40,16 +40,18 @@ type logRecord plog.LogRecord
 
 func (l logRecord) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
 	lr := plog.LogRecord(l)
+	spanID := lr.SpanID()
+	traceID := lr.TraceID()
 	err := encoder.AddObject("attributes", logging.Map(lr.Attributes()))
 	encoder.AddString("body", lr.Body().AsString())
 	encoder.AddUint32("dropped_attribute_count", lr.DroppedAttributesCount())
 	encoder.AddUint32("flags", uint32(lr.Flags()))
 	encoder.AddUint64("observed_time_unix_nano", uint64(lr.ObservedTimestamp()))
 	encoder.AddInt32("severity_number", int32(lr.SeverityNumber()))
 	encoder.AddString("severity_text", lr.SeverityText())
-	encoder.AddString("span_id", lr.SpanID().String())
+	encoder.AddString("span_id", hex.EncodeToString(spanID[:]))
 	encoder.AddUint64("time_unix_nano", uint64(lr.Timestamp()))
-	encoder.AddString("trace_id", lr.TraceID().String())
+	encoder.AddString("trace_id", hex.EncodeToString(traceID[:]))
 	return err
 }