Find{BLAS,LAPACK}: Restore targets in {BLAS,LAPACK}_LIBRARIES with NVPL

Revert commit d8ade0500e (Find{BLAS,LAPACK}: Provide full paths in
`{BLAS,LAPACK}_LIBRARIES` with NVPL, 2026-09-05).  These variables
should supply full dependency, not just the immediate library file
returned by `get_target_property(IMPORTED_LOCATION_RELEASE)`.
Since the documentation regarding these two variables has been
updated, let's keep the old behavior which actually works better.

Issue: #28073

Modules/FindBLAS.cmake

@@ -1395,7 +1395,7 @@ if(BLA_VENDOR STREQUAL "NVPL" OR BLA_VENDOR STREQUAL "All")
           set(_blas_lib "nvpl::blas${_nvpl_int}${_nvpl_thread}")
 
           if(TARGET ${_blas_lib})
-            get_target_property(BLAS_LIBRARIES ${_blas_lib} IMPORTED_LOCATION_RELEASE)
+            set(BLAS_LIBRARIES ${_blas_lib})
             break()
           endif()
 

Modules/FindLAPACK.cmake

@@ -759,7 +759,7 @@ if(NOT LAPACK_NOT_FOUND_MESSAGE)
           set(_lapack_lib "nvpl::lapack${_nvpl_int}${_nvpl_thread}")
 
           if(TARGET ${_lapack_lib})
-            get_target_property(LAPACK_LIBRARIES ${_lapack_lib} IMPORTED_LOCATION_RELEASE)
+            set(LAPACK_LIBRARIES ${_lapack_lib})
             break()
           endif()