[I] dropDeleteFilesOlderthan should be partition level instead of table level [iceberg]

[via GitHub]

zinking opened a new issue, #9383:
URL: https://github.com/apache/iceberg/issues/9383

   ### Apache Iceberg version
   
   1.4.2 (latest release)
   
   ### Query engine
   
   Spark
   
   ### Please describe the bug 🐞
   
   ```
     public List<ManifestFile> apply(TableMetadata base, Snapshot snapshot) {
       // filter any existing manifests
       List<ManifestFile> filtered =
           filterManager.filterManifests(
               SnapshotUtil.schemaFor(base, targetBranch()),
               snapshot != null ? snapshot.dataManifests(ops.io()) : null);
       long minDataSequenceNumber =
           filtered.stream()
               .map(ManifestFile::minSequenceNumber)
               .filter(
                   seq ->
                       seq
                           != ManifestWriter
                               .UNASSIGNED_SEQ) // filter out unassigned in 
rewritten manifests
               .reduce(base.lastSequenceNumber(), Math::min);
       deleteFilterManager.dropDeleteFilesOlderThan(minDataSequenceNumber);
       ```
       
      the minDataSequenceNumber is calculdated table wise, but in theory it 
should be partition wise ? 
      
      I am seeing v2 tables (partitioned tables) having delete files retained 
in partitions but those delete files wont apply to any data files within that 
partition. 


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