[GLUTEN-6887][VL] Daily Update Velox Version (2025_12_29)

[jinchengchenghh]

b959f0d89 by Ge Gao, fix: Disable SSD cache write when SSD is full (#15860)
a5bd8cd5a by Xiaoxuan Meng, refactor: Change key encoder namespace from exec to serializer (#15868)
4da242827 by Xiaoxuan Meng, refactor: Move KeyEncoder from velox/exec to velox/serializers (#15867)
64b217c63 by Xiaoxuan Meng, refactor: trival ApproxMostFrequentAggregate related code cleanup (#15866)
9377c95c0 by duanmeng, docs: Add sort analyze blog (#15856)
d9a87e74f by Xiaoxuan Meng, feat: Support normalized key encoder in Velox for sort optimizations (#15864)
6c5e02008 by Shrinidhi Joshi, Make Exchange client eager fetching behavior configurable (#15768)
37583860d by Pedro Eugenio Rocha Pedreira, perf(function): Avoid unnecessary string copies (#15863)
ba59291b1 by Shrinidhi Joshi, feat: Enable caching and re-use of HashTable in HashBuild operator (#15754)
5a46bce60 by Shrinidhi Joshi, feat: Add release callbacks to QueryCtx (#15858)
f7f995849 by Zac Wen, feat: Add maxEntries limit to SSD cache (#14879)
acee28e00 by Pedro Eugenio Rocha Pedreira, refactor: Make std::string conversions explicit (#15861)
ec451a1d4 by Pedro Eugenio Rocha Pedreira, refactor(query-ctx): Add builder pattern and documentation
7c409cc9c by Chang chen, feat: Enhance floating point value retrieval with type-specific handling in parquet reader (#15657)
e98e45e52 by beliefer, refactor: Remove unnecessary sizeof(char) (#15779)
4bd07a726 by Pedro Eugenio Rocha Pedreira, fix(variant): Variant string conversion logic on creation (#15855)

Velox branch: https://github.com/IBM/velox/tree/dft-2025_12_29

Related issue: #6887

[zhouyuan]

better to fill the Velox commits in the PR description as well, here's the cmd i used

git log last_commit_id..origin/main --pretty=format:"%h by %an, %s"