[clang-tidy] readability-container-contains literal suffixes (#74215)

Before this PR, readability-container-contains fix-its did not handle
integer literal suffixes correctly. It e.g. changed
```
  MyMap.count(2) != 0U;
```
into
```
  MyMap.contains(2)U;
```

With this PR, it correctly changes it to
```
  MyMap.contains(2);
```