HIVE-28267: Support merge task functionality for Iceberg delete files

[SourabhBadhya]

What changes were proposed in this pull request?

Support merge task functionality for Iceberg delete files

Why are the changes needed?

To merge delete files generated within a delete query.

Does this PR introduce any user-facing change?

No

Is the change a dependency upgrade?

No

How was this patch tested?

QTest

[sonarqubecloud[bot]]

Quality Gate passed

Issues
10 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud