fix: use TARGET_FILE:jana to avoid using jana in path

[wdconinc]

This PR ensures that tests use the actual built target jana executable instead of picking what's in the path.

[Copilot]

Pull request overview

Note

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Replaces hardcoded jana command references in CMake add_test invocations with the generator expression $<TARGET_FILE:jana>, ensuring tests use the built executable target rather than relying on PATH lookup or install prefix paths.

Changes:

• Substitutes jana / ${CMAKE_INSTALL_PREFIX}/bin/jana with $<TARGET_FILE:jana> across multiple add_test commands.
• Applies the change consistently to plugin and example test definitions.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/plugins/janadot/CMakeLists.txt	Use TARGET_FILE generator expression for janadot test
src/plugins/JTest/CMakeLists.txt	Use TARGET_FILE generator expression for JTest test
src/examples/tutorial_with_lightweight_datamodel/02_random_hit_source/CMakeLists.txt	Use TARGET_FILE for lw smoketest
src/examples/misc/Tutorial/CMakeLists.txt	Use TARGET_FILE for Tutorial test
src/examples/misc/TimesliceExample/CMakeLists.txt	Replace install-prefix path with TARGET_FILE for both timeslice tests
src/examples/misc/RootDatamodelExample/CMakeLists.txt	Use TARGET_FILE for rootdatamodel test
src/examples/misc/EventGroupExample/CMakeLists.txt	Use TARGET_FILE for eventgroup test
src/examples/misc/DstExample/CMakeLists.txt	Use TARGET_FILE for dst test

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