[Unreal Engine] Add Linux and Mac support to GenerateClangDatabase in UBT

Code that I pushed to Unreal Engine 5 main branch. It adds support to generate the clang database in Linux and Mac.

Before the commit that functionality was only available on Windows.

References:

• My pull request
• Commit of my pull request published by UnrealBot (my previous GitHub username was matias-arocena)

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