teach eden reloadconfig to handle --manifold-key

Summary:
# Context
To test edenfs_config changes, one can upload the raw config to manifold and ask the edenfs_config_manager to use that raw config rather than canarying the change to a machine or having a local configerator checkout.

# This Diff
I added this flag mid last year (D61072490) but didn't add it to the helper cli `reloadconfig`. This diff adds it to `reloadconfig` for ease of use. `reloadconfig` just passes the args to the `edenfs_config_manager` so you don't have to remember the path for invoking the manager.

Reviewed By: ViniGupta08

Differential Revision: D68801571

fbshipit-source-id: 8ae36a96886d6a50a108f158a254a7ecfbe381f8

eden/fs/cli_rs/edenfs-commands/src/config.rs

@@ -98,6 +98,12 @@ pub struct ReloadConfigCmd {
     )]
     canary_host: Option<PathBuf>,
 
+    #[clap(
+        long,
+        help = "Load configs from the edenfs_test_configs Manifold bucket instead of reading from remote. This is useful for testing changes locally without having to push them to production"
+    )]
+    manifold_key: Option<String>,
+
     #[clap(
         long,
         help = "If the script is ran as root, used to specify user when making requests to Configerator. Defaults to SUDO_USER, $LOGUSER, os.getlogin, or \"unknown\" in that order."
@@ -165,6 +171,10 @@ impl crate::Subcommand for ReloadConfigCmd {
             cmd.arg("--canary-host").arg(canary_host);
         }
 
+        if let Some(manifold_key) = &self.manifold_key {
+            cmd.arg("--manifold-key").arg(manifold_key);
+        }
+
         if let Some(user) = &self.user {
             cmd.arg("--user").arg(user);
         }