Add GTEST_HAS_ABSL support into gmock cmake for MSVC

[matthieugleg]

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Why this change

When building with MSVC, the sources of gtest are included directly in gmock rather than linking to gtest as a separate library. This resulted in GTEST_HAS_ABSL not being defined, causing gmock to miss linking with the necessary Abseil and RE2 libraries.

How this change fix this issue

• Added conditional compilation definitions for GTEST_HAS_ABSL when building with MSVC.
• Configured gmock and gmock_main to link with Abseil and RE2 dependencies explicitly.
• Ensured that the dependencies are linked correctly by defining GTEST_HAS_ABSL and specifying the required libraries, thus resolving build and runtime issues.

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