Find{BLAS,LAPACK}: Provide full paths in {BLAS,LAPACK}_LIBRARIES with NVPL

Documentation as of CMake 4.4.3 states that these variables provide full
paths to libraries, so some existing consumers expect it.

NVPL provides imported targets that set `IMPORTED_LOCATION_RELEASE`.

Fixes: #28073

Modules/FindBLAS.cmake

@@ -1386,7 +1386,7 @@ if(BLA_VENDOR STREQUAL "NVPL" OR BLA_VENDOR STREQUAL "All")
           set(_blas_lib "nvpl::blas${_nvpl_int}${_nvpl_thread}")
 
           if(TARGET ${_blas_lib})
-            set(BLAS_LIBRARIES ${_blas_lib})
+            get_target_property(BLAS_LIBRARIES ${_blas_lib} IMPORTED_LOCATION_RELEASE)
             break()
           endif()
 

Modules/FindLAPACK.cmake

@@ -758,7 +758,7 @@ if(NOT LAPACK_NOT_FOUND_MESSAGE)
           set(_lapack_lib "nvpl::lapack${_nvpl_int}${_nvpl_thread}")
 
           if(TARGET ${_lapack_lib})
-            set(LAPACK_LIBRARIES ${_lapack_lib})
+            get_target_property(LAPACK_LIBRARIES ${_lapack_lib} IMPORTED_LOCATION_RELEASE)
             break()
           endif()