Render Azure, JSON, and JSON lines output with the new diagnostics (#19133)

## Summary

This was originally stacked on #19129, but some of the changes I made
for JSON also impacted the Azure format, so I went ahead and combined
them. The main changes here are:

- Implementing `FileResolver` for Ruff's `EmitterContext`
- Adding `FileResolver::notebook_index` and `FileResolver::is_notebook`
methods
- Adding a `DisplayDiagnostics` (with an "s") type for rendering a group
of diagnostics at once
- Adding `Azure`, `Json`, and `JsonLines` as new `DiagnosticFormat`s

I tried a couple of alternatives to the `FileResolver::notebook` methods
like passing down the `NotebookIndex` separately and trying to reparse a
`Notebook` from Ruff's `SourceFile`. The latter seemed promising, but
the `SourceFile` only stores the concatenated plain text of the
notebook, not the re-parsable JSON. I guess the current version is just
a variation on passing the `NotebookIndex`, but at least we can reuse
the existing `resolver` argument. I think a lot of this can be cleaned
up once Ruff has its own actual file resolver.

As suggested, I also tried deleting the corresponding `Emitter` files in
`ruff_linter`, but it doesn't look like git was able to follow this as a
rename. It did, however, track that the tests were moved, so the
snapshots should be easy to review.

## Test Plan

Existing Ruff tests ported to tests in `ruff_db`. I think some other
existing ruff tests also cover parts of this refactor.

---------

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

crates/ruff_server/src/lint.rs

@@ -301,7 +301,7 @@ fn to_lsp_diagnostic(
             severity,
             tags,
             code,
-            code_description: diagnostic.to_url().and_then(|url| {
+            code_description: diagnostic.to_ruff_url().and_then(|url| {
                 Some(lsp_types::CodeDescription {
                     href: lsp_types::Url::parse(&url).ok()?,
                 })