[GLUTEN-12628][VL] Support Iceberg V3 deletion vectors in Velox

[wirybeaver]

What changes are proposed in this pull request?

Closes #12628.

Add native Iceberg format-version 3 deletion-vector support to the Velox backend:

• Serialize Puffin DV metadata through Substrait and convert it to Velox FileContent::kDeletionVector.
• Replace blanket V3 scan fallback with per-delete validation while retaining fallback for equality deletes and incomplete metadata.
• Offload Iceberg WriteDeltaExec for DELETE, UPDATE, and MERGE behind enhanced native writes.
• Preserve Iceberg's existing DeltaBatchWrite coordinator for atomic commit, validation, conflict handling, and abort cleanup.
• Seed native writers with existing DVs so repeated mutations union positions and replace the prior DV.
• Preserve Spark 3.3 behavior and add Spark 3.4–4.1 compatibility shims, including Spark 4.1 MERGE summaries.
• Add native, Scala, and enhanced end-to-end coverage, and run targeted native DV tests in enhanced CI.

How was this patch tested?

Passed:

• ./dev/format-scala-code.sh
• git diff --check
• Focused Spark 3.5 Iceberg tests: 2 JUnit and 8 Scala tests
• Focused Spark 3.5 Velox backend tests: 11 tests
• Spark 3.4 clean test-compile
• Spark 4.0 / Scala 2.13 / Java 17 clean test-compile
• Direct compatibility compilation of the V2 write shims against Spark 3.3, 3.4, 3.5, 4.0, and 4.1
• Direct compilation of the Spark 4.1 columnar V2 commit path and Spark 4.0 enhanced DV suite
• Enhanced workflow YAML parsing

Not completed locally:

• Native C++ and enhanced end-to-end execution require a rebuilt enhanced Velox backend.
• Spark 4.1 Maven tests are blocked by HTTP 403 responses for the Iceberg 1.11.0 test artifacts.
• The license-header command is blocked because dev/license-header.py is absent from this checkout.
• C++ formatting passed earlier with clang-format 15; it could not be rerun after the final JNI cleanup because clang-format is no longer available in the environment.

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