Make std::filesystem::path conversion to/from UTF-8 encoded string explicit (#4631)

* Make std::filesystem::path conversion to/from UTF-8 encoded JSON string explicit.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Experimental: Changing C++ standard detection logic to accommodate potential corner cases.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Drop C++ standard tests for compilers which do not implement required features.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

* Drop C++ standard tests for MSVC versions which do not implement required features.

Signed-off-by: Richard Musil <risa2000x@gmail.com>

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Signed-off-by: Richard Musil <risa2000x@gmail.com>
Co-authored-by: Richard Musil <risa2000x@gmail.com>