Support disabling tool suggest for specific tools. (#20072)

## Summary
- Add `disable_tool_suggest` to app and plugin config, schema, and
TypeScript output
- Exclude disabled connectors and plugins from tool suggestion discovery
- Persist "never show again" tool-suggestion choices back into
`config.toml`
- Update config docs and add coverage for connector and plugin
suppression

## Testing
- Added and updated unit tests for config persistence and tool-suggest
filtering
- Not run (not requested)

codex-rs/core/src/connectors.rs

@@ -419,6 +419,14 @@ async fn tool_suggest_connector_ids(config: &Config) -> HashSet<String> {
             .filter(|discoverable| discoverable.kind == ToolSuggestDiscoverableType::Connector)
             .map(|discoverable| discoverable.id.clone()),
     );
+    let disabled_connector_ids = config
+        .tool_suggest
+        .disabled_tools
+        .iter()
+        .filter(|disabled_tool| disabled_tool.kind == ToolSuggestDiscoverableType::Connector)
+        .map(|disabled_tool| disabled_tool.id.as_str())
+        .collect::<HashSet<_>>();
+    connector_ids.retain(|connector_id| !disabled_connector_ids.contains(connector_id.as_str()));
     connector_ids
 }