fix(meta): fixes for LastUpdated and TaggedTimestamp (#3754)

1. Parse repos without metadata in ParseStorage

The timestamp check in ParseStorage was skipping repos that exist in
storage but don't have metadata. When GetRepoLastUpdated returns zero
time (no metadata), we should always parse the repo to create its
metadata. Check if metaLastUpdated is zero before comparing timestamps.
If zero, always parse regardless of storageLastUpdated.

2. Change the logic of how LastUpdated is computed in RepoSummary

It is not the latest tagged timestamp from the available images or
the last updated image created timestamp, based on whichever is the
latest.

Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com>

pkg/meta/parse.go

@@ -69,7 +69,9 @@ func ParseStorage(metaDB mTypes.MetaDB, storeController stypes.StoreController,
 
 		metaLastUpdated := metaDB.GetRepoLastUpdated(repo)
 
-		if storageLastUpdated.Before(metaLastUpdated) {
+		// If repo metadata doesn't exist (zero time), always parse it
+		// Otherwise, only parse if storage is newer than metadata
+		if !metaLastUpdated.IsZero() && storageLastUpdated.Before(metaLastUpdated) {
 			continue
 		}