Native server does not respect .gitignore

[dhruvmanila]

Following up on #12242, the native server does not respect .gitignore, specifically it does not consider the respect_gitignore file resolver setting.

[dhruvmanila]

Currently, this is a bit difficult to figure out i.e., whether a single path is being gitignored or not. ruff-lsp didn't do that either because it uses stdin and ruff would always provide diagnostics if checked via stdin

ruff/crates/ruff_workspace/src/resolver.rs

Lines 649 to 651 in 9163ad8

	/// Return `true` if the given top-level [`Path`] should be excluded.
	fn is_file_excluded(path: &Path, resolver: &Resolver) -> bool {
	// TODO(charlie): Respect gitignore.

The ignore crate has a Gitignore struct which could possibly be used but we'd still need to collect all the ignore files to consider in it.

[MichaReiser]

I think I'm fine not supporting this for now. But yeah, we face a similar problem in red-knot. We may have to vendor the ignore crate longterm and check for every new file if it is excluded.