Merge branch 'feat/565-add-metric-tooltip' into metric-store-tickets

Resolve conflicts in the generated GraphQL code by regenerating it against
the merged schema. cc-lib v2.13.0 adds Tooltip to schema.MetricConfig and
schema.GlobalMetricListItem, so gqlgen now binds the tooltip field directly
and the hand-written globalMetricListItem/metricConfig resolvers introduced
on the tooltip branch are no longer needed.

Also migrate to the cc-lib v2.13.0 metric container types, which changed
from bare maps to structs carrying array-valued metric groups:

  schema.JobData          map -> {Metrics, Groups}
  schema.ScopedJobStats   map -> {Metrics, Groups}
  job.Statistics          map -> schema.JobStatisticsSet{Metrics, Groups}

Callers index .Metrics, return the zero struct instead of nil, and
deepCopy/DecodeJobStats now also carry the Groups payload through.
archive.GetStatistics returns the full JobStatisticsSet so group
statistics survive the round trip.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/archive/s3Backend.go

@@ -330,7 +330,7 @@ func (s3a *S3Archive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 		})
 		if err != nil {
 			cclog.Errorf("S3Archive LoadJobData() > GetObject error: %v", err)
-			return nil, err
+			return schema.JobData{}, err
 		}
 		defer result.Body.Close()
 
@@ -349,7 +349,7 @@ func (s3a *S3Archive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 	r, err := gzip.NewReader(result.Body)
 	if err != nil {
 		cclog.Errorf("S3Archive LoadJobData() > gzip error: %v", err)
-		return nil, err
+		return schema.JobData{}, err
 	}
 	defer r.Close()
 
@@ -381,14 +381,14 @@ func (s3a *S3Archive) LoadJobStats(job *schema.Job) (schema.ScopedJobStats, erro
 		})
 		if err != nil {
 			cclog.Errorf("S3Archive LoadJobStats() > GetObject error: %v", err)
-			return nil, err
+			return schema.ScopedJobStats{}, err
 		}
 		defer result.Body.Close()
 
 		if config.Keys.Validate {
 			b, _ := io.ReadAll(result.Body)
 			if err := schema.Validate(schema.Data, bytes.NewReader(b)); err != nil {
-				return nil, fmt.Errorf("validate job data: %v", err)
+				return schema.ScopedJobStats{}, fmt.Errorf("validate job data: %v", err)
 			}
 			return DecodeJobStats(bytes.NewReader(b), key)
 		}
@@ -400,14 +400,14 @@ func (s3a *S3Archive) LoadJobStats(job *schema.Job) (schema.ScopedJobStats, erro
 	r, err := gzip.NewReader(result.Body)
 	if err != nil {
 		cclog.Errorf("S3Archive LoadJobStats() > gzip error: %v", err)
-		return nil, err
+		return schema.ScopedJobStats{}, err
 	}
 	defer r.Close()
 
 	if config.Keys.Validate {
 		b, _ := io.ReadAll(r)
 		if err := schema.Validate(schema.Data, bytes.NewReader(b)); err != nil {
-			return nil, fmt.Errorf("validate job data: %v", err)
+			return schema.ScopedJobStats{}, fmt.Errorf("validate job data: %v", err)
 		}
 		return DecodeJobStats(bytes.NewReader(b), keyGz)
 	}