Allow EventEmitters to be reported as optional (#53804)

Summary:
Pull Request resolved: #53804

## Changelog:

[General] [Fixed] - Allow `EventEmitter`s to be optional (for push safety)

Reviewed By: javache

Differential Revision: D82509571

fbshipit-source-id: 801a22b10b2709968009527130cfa890d30a4f3a

Author: Tom Scallon

packages/react-native-codegen/src/parsers/parsers-commons.js

@@ -540,7 +540,7 @@ function buildEventEmitterSchema(
 
   return {
     name: eventemitterName,
-    optional: false,
+    optional: Boolean(property.optional),
     typeAnnotation: {
       type: 'EventEmitterTypeAnnotation',
       typeAnnotation: eventTypeAnnotation,