feat: Add workspace plugin sharing APIs (#20278)

1. Adds v2 plugin/share/save, plugin/share/list, and plugin/share/delete
RPCs.
2. Implements save by archiving a local plugin root, enforcing a size
limit, uploading through the workspace upload flow, and supporting
updates via remotePluginId.
3. Lists created workspace plugins
4. Deletes a previously uploaded/shared plugin.

codex-rs/app-server/tests/suite/v2/plugin_install.rs

@@ -177,7 +177,6 @@ async fn plugin_install_rejects_remote_marketplace_when_remote_plugin_is_disable
             .message
             .contains("remote plugin install is not enabled")
     );
-    assert!(err.error.message.contains("chatgpt-global"));
     Ok(())
 }
 
@@ -405,11 +404,6 @@ async fn plugin_install_rejects_invalid_remote_plugin_name() -> Result<()> {
 
     assert_eq!(err.error.code, -32600);
     assert!(err.error.message.contains("invalid remote plugin id"));
-    assert!(
-        err.error
-            .message
-            .contains("only ASCII letters, digits, `_`, `-`, and `~` are allowed")
-    );
     Ok(())
 }
 
@@ -1314,7 +1308,7 @@ async fn send_remote_plugin_install_request(
 ) -> Result<i64> {
     mcp.send_plugin_install_request(PluginInstallParams {
         marketplace_path: None,
-        remote_marketplace_name: Some("chatgpt-global".to_string()),
+        remote_marketplace_name: Some("caller-marketplace-is-ignored".to_string()),
         plugin_name: remote_plugin_id.to_string(),
     })
     .await