Set CMP0144 before finding PCL

[Daniiiil1]

Summary

• select CMake policy CMP0144 before loading PCL in grid_map_pcl
• apply the same guarded policy selection in grid_map_sdf
• retain compatibility with CMake versions that predate CMP0144

This prevents CMake 3.27+ developer warnings when PCL configures dependencies through legacy upper-case variables such as EIGEN_ROOT and FLANN_ROOT.

Validation

• git diff --check
• verified the guarded policy selection precedes each find_package(PCL ...) call
• parsed both edited CMake files with CMake 4.4.2 available locally; a full ROS 2/PCL workspace build is left to project CI because that toolchain is not installed locally

Fixes #441

Signed-off-by: Daniil Mordanov mordanovdania@gmail.com

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