[24263] Fix TinyXML2 library resolution in tests

[raulojeda22]

Description

On Ubuntu 24.04, TinyXML2 is found via CMake config mode, setting TINYXML2_LIBRARY to the target name tinyxml2::tinyxml2 instead of a file path. This caused get_filename_component to produce an empty directory, resulting in broken Docker volume mounts and missing LD_LIBRARY_PATH entries for all example tests. The fix extracts the actual library path from the imported target properties.

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• N/A Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A Any new/modified methods have been properly documented using Doxygen.
• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• N/A Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• N/A Changes are API compatible.
• N/A New feature has been added to the versions.md file (if applicable).
• N/A New feature has been documented/Current behavior is correctly described in the documentation.
• N/A Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[mergify]

🧪 CI Insights

Here's what we observed from your CI run for c7ef33f.

❌ Job Failures

Pipeline	Job	Health on master	Retries	🔍 CI Insights	📄 Logs
Fast DDS MacOS CI	mac-ci / fastdds_test ()		0	View	View
Fast DDS Windows CI	windows-ci / fastdds_test (RelWithDebInfo, examples), v142		0	View	View
	windows-ci / fastdds_test (RelWithDebInfo, examples), v143		0	View	View

[richiware]

Update copyright year because it is a new file.