WIP: Add a setting to visually redact enviroment variables (#7124)

Release Notes:

- Added bash syntax highlighting to `.env` files. 
- Added a `private_files` setting for configuring which files should be
considered to contain environment variables or other sensitive
information.
- Added a `redact_private_values` setting to add or remove censor bars
over variable values in files matching the `private_files` patterns.
-(internal) added a new `redactions.scm` query to our language support,
allowing different config file formats to indicate where environment
variable values can be identified in the syntax tree, added this query
to `bash`, `json`, `toml`, and `yaml` files.

---------

Co-authored-by: Nathan <nathan@zed.dev>

crates/copilot_ui/src/copilot_button.rs

@@ -225,8 +225,9 @@ impl CopilotButton {
         let file = snapshot.file_at(suggestion_anchor).cloned();
 
         self.editor_enabled = Some(
-            all_language_settings(self.file.as_ref(), cx)
-                .copilot_enabled(language, file.as_ref().map(|file| file.path().as_ref())),
+            file.as_ref().map(|file| !file.is_private()).unwrap_or(true)
+                && all_language_settings(self.file.as_ref(), cx)
+                    .copilot_enabled(language, file.as_ref().map(|file| file.path().as_ref())),
         );
         self.language = language.cloned();
         self.file = file;