Report errors in configs, and load configs from anywhere (#7650)

* Validate .yaml files and add "Open folder" button

* Fix dataconnect error

* Use RC file as source of truth for the current project ID.

This avoids the extension overwriting the selected project if the RC file is manually edited.

* Refactor subscriptions

* Lod nested configs

* Onboarding changes

* Revert changes extracted into separate PRs

* Make TS happy

* Update config logic to show dropdown when 2+ firebase.json are detected

* Remove logs

* Fix if

* Use effect cleanup

* Add doc to follow

* Use effect cleanup again

* Remove `if`

---------

Co-authored-by: Harold Shen <hlshen@google.com>

firebase-vscode/common/messaging/protocol.ts

@@ -29,6 +29,7 @@ export interface WebviewToExtensionParamsMap {
    */
   getInitialData: {};
   getInitialHasFdcConfigs: void;
+  getInitialFirebaseConfigList: void;
 
   addUser: {};
   logout: { email: string };
@@ -43,6 +44,9 @@ export interface WebviewToExtensionParamsMap {
   /** Trigger project selection */
   selectProject: {};
 
+  /** When 2+ firebase.json are detected, the user can manually pick one */
+  selectFirebaseConfig: string;
+
   /**
    * Prompt user for text input
    */
@@ -123,6 +127,12 @@ export interface ExtensionToWebviewParamsMap {
     infos?: RunningEmulatorInfo | undefined;
   };
 
+  /** Lists all firebase.json in the workspace */
+  notifyFirebaseConfigListChanged: {
+    values: string[];
+    selected: string | undefined;
+  };
+
   notifyEmulatorsHanging: boolean;
 
   /** Triggered when new environment variables values are found. */