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/sqliteBackend.go

@@ -252,7 +252,7 @@ func (sa *SqliteArchive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 		job.JobID, job.Cluster, job.StartTime).Scan(&dataBlob, &compressed)
 	if err != nil {
 		cclog.Errorf("SqliteArchive LoadJobData() > query error: %v", err)
-		return nil, err
+		return schema.JobData{}, err
 	}
 	key := fmt.Sprintf("%s:%d:%d", job.Cluster, job.JobID, job.StartTime)
 
@@ -261,7 +261,7 @@ func (sa *SqliteArchive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 		gzipReader, err := gzip.NewReader(reader)
 		if err != nil {
 			cclog.Errorf("SqliteArchive LoadJobData() > gzip error: %v", err)
-			return nil, err
+			return schema.JobData{}, err
 		}
 		defer gzipReader.Close()
 		reader = gzipReader
@@ -285,7 +285,7 @@ func (sa *SqliteArchive) LoadJobStats(job *schema.Job) (schema.ScopedJobStats, e
 		job.JobID, job.Cluster, job.StartTime).Scan(&dataBlob, &compressed)
 	if err != nil {
 		cclog.Errorf("SqliteArchive LoadJobStats() > query error: %v", err)
-		return nil, err
+		return schema.ScopedJobStats{}, err
 	}
 	key := fmt.Sprintf("%s:%d:%d", job.Cluster, job.JobID, job.StartTime)
 
@@ -294,7 +294,7 @@ func (sa *SqliteArchive) LoadJobStats(job *schema.Job) (schema.ScopedJobStats, e
 		gzipReader, err := gzip.NewReader(reader)
 		if err != nil {
 			cclog.Errorf("SqliteArchive LoadJobStats() > gzip error: %v", err)
-			return nil, err
+			return schema.ScopedJobStats{}, err
 		}
 		defer gzipReader.Close()
 		reader = gzipReader
@@ -303,7 +303,7 @@ func (sa *SqliteArchive) LoadJobStats(job *schema.Job) (schema.ScopedJobStats, e
 	if config.Keys.Validate {
 		data, _ := io.ReadAll(reader)
 		if err := schema.Validate(schema.Data, bytes.NewReader(data)); 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(data), key)
 	}