[Iceberg] Fix querying data_sequence_number with equality deletes

[xieandrew]

Description

Fixes the error "Duplicate key $data_sequence_number" when trying to query "$data_sequence_number" on an Iceberg table that has equality deletes. Because Presto implicitly adds a data_sequence_number column in IcebergEqualityDeleteAsJoin already, when this column is explicitly added to the query the column is duplicated and the error occurs.

Motivation and Context

Closes #24629.

Impact

Allows querying "$data_sequence_number" in tables with equality deletes.

Test Plan

Since Presto does not generate equality deletes (only position deletes), use Apache Flink to create the table following the steps outlined in the original issue comments. Then use call iceberg.system.register_table('schemaName', 'tableName', 'metadataDir') to import the table to Presto and run the query select "$data_sequence_number", * from sample;

This query fails before this change and successfully returns rows after.

A unit test was added IcebergDistributedTestBase.

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Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

Iceberg Connector Changes
* Fix error querying ``$data_sequence_number`` metadata column for table with equality deletes.

[hantangwangd]

Thanks for this fix, the main logic looks reasonable to me. Considering that the variables in table scan node's assignment might also have suffixes (e.g. when a single SQL statement involves $data_sequence_number columns from multiple tables), we need to make some adjustments to support such scenarios.

[steveburnett]

Thanks for the release note! Formatting nit:

== RELEASE NOTES ==

Iceberg Connector Changes
* Fix error querying ``$data_sequence_number`` metadata column for table with equality deletes.

[xieandrew]

Thanks, I've edited the release note with the correct format.

[hantangwangd]

Thanks for the fix, overall looks good to me. Just one thing for discussing.