Add ability to run ESLint (and other non-primary language server) code actions on format (#8496)

This PR does two things to fix
https://github.com/zed-industries/zed/issues/4325:

1. It changes the way `code_actions_on_format` works to send the
possibly configured code actions to _all_ (and not just the primary)
languages servers. That means configured code actions can now be sent to
ESLint, tailwind, ... and other language servers.
2. It enables `codeActionsOnSave` by default for ESLint. That does
**not** mean that by default we will run something on save, but only
that we enable it for ESLint.

Users can then configure their Zed to run the `eslint` code action on
format. Example, for JavaScript:

```json
    {
      "languages": {
        "JavaScript": {
          "code_actions_on_format": {
            "source.fixAll.eslint": true
          }
        },
      }
    }
```

Release Notes:

- Added ability to run ESLint fixes when formatting a buffer. Code
actions configured in
[`code_actions_on_format`](https://zed.dev/docs/configuring-zed#code-actions-on-format)
are now being sent to _all_ language servers connected to a buffer, not
just the primary one. So if a user now sets `"code_actions_on_format": {
"source.fixAll.eslint": true }` in their Zed settings, the
`source.fixAll.eslint` code action will be sent to ESLint, which is not
a primary language server. Since the formatter (prettier, or external
commands, or another language server, ...) still runs, it's important
that these code actions and the formatter don't clash.
([#4325](https://github.com/zed-industries/zed/issues/4325)).

Demo:



https://github.com/zed-industries/zed/assets/1185253/9ef03ad5-1f5c-4d46-b72a-eef611e32f39

crates/languages/src/typescript.rs

@@ -241,6 +241,11 @@ impl LspAdapter for EsLintLspAdapter {
                         .unwrap_or_else(|| workspace_root.as_os_str()),
                 },
                 "problems": {},
+                "codeActionOnSave": {
+                    // We enable this, but without also configuring `code_actions_on_format`
+                    // in the Zed configuration, it doesn't have an effect.
+                    "enable": true,
+                },
                 "experimental": {
                     "useFlatConfig": workspace_root.join("eslint.config.js").is_file(),
                 },