[clang-tools-extra] [clang-tidy] Extend `performance-faster-string-find` to handle ternary operator arguments (PR #187069)

[Victor Chernyakin via cfe-commits]

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localspook wrote:

We want to find cases like the following though, right?
```cpp
std::string s;
s += foo ? "0" : "1";
```

https://github.com/llvm/llvm-project/pull/187069