feat: use fs-err in more places

[Hofer-Julian]

I've noticed that there are still many places where we don't use fs-err

[baszalmstra]

We could add the following to a clippy.toml file at the root to make sure we use fs_err everywhere.

disallowed-types = [
  "std::fs::DirEntry",
  "std::fs::File",
  "std::fs::OpenOptions",
  "std::fs::ReadDir",
]

disallowed-methods = [
  "std::fs::canonicalize",
  "std::fs::copy",
  "std::fs::create_dir",
  "std::fs::create_dir_all",
  "std::fs::hard_link",
  "std::fs::metadata",
  "std::fs::read",
  "std::fs::read_dir",
  "std::fs::read_link",
  "std::fs::read_to_string",
  "std::fs::remove_dir",
  "std::fs::remove_dir_all",
  "std::fs::remove_file",
  "std::fs::rename",
  "std::fs::set_permissions",
  "std::fs::soft_link",
  "std::fs::symlink_metadata",
  "std::fs::write",
]

[Hofer-Julian]

disallowed-types = [
  "std::fs::DirEntry",
  "std::fs::File",
  "std::fs::OpenOptions",
  "std::fs::ReadDir",
]

disallowed-methods = [
  "std::fs::canonicalize",
  "std::fs::copy",
  "std::fs::create_dir",
  "std::fs::create_dir_all",
  "std::fs::hard_link",
  "std::fs::metadata",
  "std::fs::read",
  "std::fs::read_dir",
  "std::fs::read_link",
  "std::fs::read_to_string",
  "std::fs::remove_dir",
  "std::fs::remove_dir_all",
  "std::fs::remove_file",
  "std::fs::rename",
  "std::fs::set_permissions",
  "std::fs::soft_link",
  "std::fs::symlink_metadata",
  "std::fs::write",
]

Great idea!

Done!