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ARROW-10948: [C++] Always use GTestConfig.cmake

Because FindGTest.cmake can't detect GoogleTest version. We need
version to ensure using GoogleTest 1.10.0 or later.

Closes #8945 from kou/cpp-gtest

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>