Put zed: open account settings action behind a feature flag (#17014)

This PR puts the `zed: open account settings` action behind the
`zed-pro` feature flag, as it isn't supposed to be visible to users yet.

Closes https://github.com/zed-industries/zed/issues/17010.

Release Notes:

- N/A

crates/zed/Cargo.toml

@@ -32,6 +32,7 @@ client.workspace = true
 collab_ui.workspace = true
 collections.workspace = true
 command_palette.workspace = true
+command_palette_hooks.workspace = true
 copilot.workspace = true
 db.workspace = true
 diagnostics.workspace = true
@@ -39,9 +40,10 @@ editor.workspace = true
 env_logger.workspace = true
 extension.workspace = true
 extensions_ui.workspace = true
+feature_flags.workspace = true
 feedback.workspace = true
-file_icons.workspace = true
 file_finder.workspace = true
+file_icons.workspace = true
 fs.workspace = true
 futures.workspace = true
 git.workspace = true