Resolve unit-test timeout issues (#39292)

* implement AllocateFrom

* fix PR-CI-Coverage timeout in 120s
Co-authored-by: Nzkh2016 <zhangkaihuo@baidu.com>

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -960,7 +960,7 @@ else()
     set_tests_properties(test_layer_norm_op PROPERTIES TIMEOUT 150)
     set_tests_properties(test_pool3d_op PROPERTIES TIMEOUT 150)
 endif()
-set_tests_properties(test_imperative_selected_rows_to_lod_tensor PROPERTIES TIMEOUT 120)
+set_tests_properties(test_imperative_selected_rows_to_lod_tensor PROPERTIES TIMEOUT 200)
 set_tests_properties(test_index_select_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_parallel_ssa_graph_inference_feed_partial_data PROPERTIES TIMEOUT 120)
 set_tests_properties(test_parallel_executor_crf PROPERTIES TIMEOUT 120)