Replace more instances of KdTreeFLANN and pcl::search::KdTree (Part 2)

[mvieth]

Follow-up of #6347

[Copilot]

Pull Request Overview

This PR continues the migration from deprecated KdTreeFLANN and pcl::search::KdTree to the modern pcl::search::autoSelectMethod API, following up on PR #6347. The changes improve search method selection by automatically choosing the optimal search implementation based on cloud characteristics.

Key changes:

• Replace manual KdTree instantiation with autoSelectMethod calls across multiple modules
• Update function signatures to use generic Search interface instead of KdTree-specific types
• Add missing header includes for files that now depend on the auto-selection functionality

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/mls_smoothing.cpp	Remove unused KdTree setup and include
tools/gp3_surface.cpp	Remove manual KdTree instantiation
tools/fpfh_estimation.cpp	Remove manual KdTree setup and include
tools/compute_cloud_error.cpp	Replace KdTreeFLANN with autoSelectMethod
surface/include/pcl/surface/*.h	Remove deprecated KdTree type aliases
surface/include/pcl/surface/impl/*.hpp	Replace manual tree selection with autoSelectMethod
segmentation/include/pcl/segmentation/impl/*.hpp	Modernize search method initialization
search/include/pcl/search/auto.*	Add overload supporting indices parameter
registration files	Update to use generic Search interface
test files	Add required kdtree.h includes

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}