ENH: Use modern ITK interface library for example

[blowekamp]

Replace ITK_LIBRARIES with ITK::PrincipalComponentsAnalysisModule interface library.

• Remove explicit include_directories as the interface library handles this automatically
• Ensures proper dependency linking with modern CMake target interface libraries

[hjmjohnson]

The PrincipalComponentsAnalysis module has been ingested into ITK proper; this remote-module repository is archived and unmaintained. This PR added a modern ITK interface library for the standalone example build, which is obsolete by ingestion (the module's example now builds within ITK proper). Closing as part of draining the archived remote-module backlog. See the in-tree module at https://github.com/InsightSoftwareConsortium/ITK