Don't trigger an IntelliSense update on fileChanged/Created/Deleted if it's not a C/C++ file

[sean-mcmanus]

          > @bobbrow fileChanged/Created/Deleted triggers an IntelliSense update unless the file or the file's folder is filtered from a files.exclude setting. So sure you can put the cmake build folder in your workspace folder, but you should also add it to the C_Cpp.files.exclude to avoid unnecessary IntelliSense updating.

Can we change that behavior? If it's obviously not a C or C++ file, I don't see why we would want to trigger an IntelliSense update. We have filters for non-C/C++ files (based on file extension) in the TypeScript code so it doesn't seem wrong to do the same thing in the language server.

Originally posted by @bobbrow in #10651 (comment)

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