feat: don't search in sapling source control directories

This file should be treated as the .git dir and not show up in the candidates
list for files.

rust/finder.rs

@@ -10,12 +10,17 @@ pub fn find_files(options: Options) -> Vec<String> {
     let base_path = &fs::canonicalize(options.directory).unwrap();
 
     let mut builder = WalkBuilder::new(base_path);
+    // Search for hidden files and directories
     builder.hidden(false);
+    // Don't require a git repo to use .gitignore files. We want to use the .gitignore files
+    // wherever we are
+    builder.require_git(false);
 
     // TODO(ade): Remove unwraps and find a good way to get the errors into the UI. Currently there
     // is no way to handel errors in the rust library
     let mut override_builder = OverrideBuilder::new("");
     override_builder.add("!.git").unwrap();
+    override_builder.add("!.sl").unwrap();
 
     let overrides = override_builder.build().unwrap();
     builder.overrides(overrides);