fix(server): Correctly set album start and end dates (#4698)

* fix(server): Correctly set album start and end dates

Currently, the query that retrieves album assets uses
`ORDER BY assets.fileCreatedAt DESC`, which makes the existing logic
return the start/end dates reversed (with `startDate` being taken from
the first asset in the array).

Instead of using the index-based approach, this change iterates through
assets to get the min/max `fileCreatedAt`. This will avoid any future
issues, if the query ordering changes, or becomes customizable (e.g. in
case the user prefers to visualize older assets first).

* fix: Maintain constant cost and only swap variables if needed

server/src/domain/metadata/metadata.service.spec.ts

@@ -277,7 +277,7 @@ describe(MetadataService.name, () => {
         id: assetStub.withLocation.id,
         duration: null,
         fileCreatedAt: assetStub.withLocation.createdAt,
-        localDateTime: new Date('2023-02-23T05:06:29.716Z'),
+        localDateTime: new Date('2023-02-22T05:06:29.716Z'),
       });
     });