The `yamllinters.py` script assumes the `evergreen` binary is located in the `$HOME` directory. If `evergreen` is located in `$PATH` but not `$HOME`, the script fails.

```shell
$ ls $HOME/evergreen
ls: cannot access '/home/cedric/evergreen': No such file or directory

$ which evergreen
/usr/local/bin/evergreen

$ bazel run lint
...
FileNotFoundError: [Errno 2] No such file or directory: '/home/cedric/evergreen'
ERROR: Linter run failed, see details above
```

This change updates the script to first check for the binary in `$PATH`, using `$HOME/evergreen` as a fallback.