Move Pylint rendering to ruff_db (#19340)

Summary
--

This is a very simple output format, the only decision is what to do if
the file
is missing from the diagnostic. For now, I opted to `unwrap_or_default`
both the
path and the `OneIndexed` row number, giving `:1: main diagnostic
message` in
the test without a file.

Another quirk here is that the path is relativized. I just pasted in the
`relativize_path` and `get_cwd` implementations from `ruff_linter::fs`
for now,
but maybe there's a better place for them.

I didn't see any details about why this needs to be relativized in the
original
[issue](https://github.com/astral-sh/ruff/issues/1953),
[PR](https://github.com/astral-sh/ruff/pull/1995), or in the pylint

[docs](https://flake8.pycqa.org/en/latest/internal/formatters.html#pylint-formatter),
but it did change the results of the CLI integration test when I tried
deleting
it. I haven't been able to reproduce that in the CLI, though, so it may
only
happen with `Command::current_dir`.

Test Plan
--

Tests ported from `ruff_linter` and a new test for the case with no file

---------

Co-authored-by: Micha Reiser <micha@reiser.io>

crates/ruff_source_file/src/line_index.rs

@@ -624,6 +624,12 @@ impl OneIndexed {
     }
 }
 
+impl Default for OneIndexed {
+    fn default() -> Self {
+        Self::MIN
+    }
+}
+
 impl fmt::Display for OneIndexed {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         std::fmt::Debug::fmt(&self.0.get(), f)