RTEMS | testsuites/unit: Add missing libvalidation dependency (!1253)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1253

Project:Branches: D3athSkulll/rtems:fix-tests-issue to rtems/rtos/rtems:main
Author:   SHIVAM DEOLANKAR



## Summary

Some unit tests use helper infrastructure provided by libvalidation, such as SetFatalHandler() and CallWithinISR(). Without an explicit dependency, builds with BUILD_VALIDATIONTESTS=False failed during linking due to unresolved symbols. This fix adds the missing build dependency on libvalidation to the unit test group.

Fixes #5568

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