Support google/fuzztest with Cmake

I've been wanting to make use of [google/fuzztest](https://github.com/google/fuzztest) which looks like a great tool. There was an effort to get this working with oss-fuzz in #8678. #8678 was closed as completed with #8784. However it seems like #8784 [only addressed Bazel specific projects](https://github.com/google/oss-fuzz/pull/8784/files#diff-3338c7c3cd8911a3a42452fc209ae6f1c2c70541adb62768f688247494904656R35). It'd be great to get this working with cmake, but it's unclear how to do this. Is there anything planned to support this in future?

Review the CMake-related gap described here alongside the completed work in #8678 and #8784, especially the distinction between Bazel and CMake projects. Determine the support path for google/fuzztest in CMake-based OSS-Fuzz projects; done means the integration works for those projects and its usage is clear.

Written by the indexing model from the issue text.