Extract Ruby extension (#11360)

This PR extracts Ruby and ERB support into an extension and removes the
built-in Ruby and Ruby support from Zed.

As part of this, the new extension is prepared for adding support for
the `Ruby LSP` which has some blockers. See
https://github.com/zed-industries/zed/pull/8613 I was thinking of adding
an initial support for Ruby LSP but I think it would be better to start
with extracting the Ruby extension for now.

The implementation, as the 1st step, matches the bundled version but
with 3 differences:

1. Added signature output to the completion popup. See my comment below.
![CleanShot 2024-05-04 at 09 17
37@2x](https://github.com/zed-industries/zed/assets/1894248/486b7a48-ea0c-44ce-b0c9-9f8f5d3ad42d)

3. Use the shell environment for starting the `solargraph` executable.
See my comment below.
4. Bumped the tree sitter version for Ruby to the latest available
version.

Additionally, I plan to tweak this extension a bit in the future but I
think we should do this bit by bit. Thanks!

Release Notes:

- Removed built-in support for Ruby, in favor of making it available as
an extension.

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/extensions_ui/src/extension_suggest.rs

@@ -58,6 +58,7 @@ const SUGGESTIONS_BY_EXTENSION_ID: &[(&str, &[&str])] = &[
     ("r", &["r", "R"]),
     ("racket", &["rkt"]),
     ("rescript", &["res", "resi"]),
+    ("ruby", &["rb", "erb"]),
     ("scheme", &["scm"]),
     ("scss", &["scss"]),
     ("sql", &["sql"]),