Miscellaneous fixes for the exp release and reference doc generation (#4521)

* remove api extractor things for storage-types

* generate api json for Firestore reference doc generation

* fix firestore api report

Author: Feiyang1

common/api-review/firestore-exp.api.md

@@ -4,7 +4,7 @@
 
 ```ts
 
-import { FirebaseApp } from '@firebase/app-types-exp';
+import { FirebaseApp } from '@firebase/app-exp';
 import { LogLevelString as LogLevel } from '@firebase/logger';
 
 // @public

common/api-review/firestore-lite.api.md

@@ -4,7 +4,7 @@
 
 ```ts
 
-import { FirebaseApp } from '@firebase/app-types-exp';
+import { FirebaseApp } from '@firebase/app-exp';
 import { LogLevelString as LogLevel } from '@firebase/logger';
 
 // @public