/auto (#16696)

Add `/auto` behind a feature flag that's disabled for now, even for
staff.

We've decided on a different design for context inference, but there are
parts of /auto that will be useful for that, so we want them in the code
base even if they're unused for now.

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/project_panel/src/project_panel.rs

@@ -1823,6 +1823,7 @@ impl ProjectPanel {
                         path: entry.path.join("\0").into(),
                         inode: 0,
                         mtime: entry.mtime,
+                        size: entry.size,
                         is_ignored: entry.is_ignored,
                         is_external: false,
                         is_private: false,