Missed opportunity to use Where - false positive

[sungam3r]

CodeQL scanning results: https://github.com/graphql-dotnet/parser/security/code-scanning/888?query=ref%3Arefs%2Fheads%2Fmaster

This is a false positive for a pattern like that

foreach (var i in items)
    if (condition(i)) return i;

[sungam3r]

One more example with throw: https://github.com/graphql-dotnet/graphql-dotnet/security/code-scanning/401?query=ref%3Arefs%2Fheads%2Fdevelop

[baywet]

Hi @sungam3r
I've put together a fix for this in #22484 because I also keep running into this thing in multiple repositories. Let me know what you think!

(Although I work at Microsoft, I'm not from the codeql team and should be considered an external contributor in this context)