Refactor NativeModuleUnionTypeAnnotation (facebook#54594)

Summary:

Refactoring `NativeModuleUnionTypeAnnotation` to use the newly introduced `NativeModuleUnionTypeAnnotationMemberType`

Changelog: [Internal]

Differential Revision: D87386775

Author: arushikesarwani94

packages/react-native-codegen/src/CodegenSchema.d.ts

@@ -406,11 +406,6 @@ export interface NativeModulePromiseTypeAnnotation {
   readonly elementType: Nullable<NativeModuleBaseTypeAnnotation> | VoidTypeAnnotation;
 }
 
-export type UnionTypeAnnotationMemberType =
-  | 'NumberTypeAnnotation'
-  | 'ObjectTypeAnnotation'
-  | 'StringTypeAnnotation';
-
 export type NativeModuleUnionTypeAnnotationMemberType =
   | NativeModuleObjectTypeAnnotation
   | StringLiteralTypeAnnotation
@@ -420,10 +415,8 @@ export type NativeModuleUnionTypeAnnotationMemberType =
   | StringTypeAnnotation
   | NumberTypeAnnotation;
 
-export interface NativeModuleUnionTypeAnnotation {
-  readonly type: 'UnionTypeAnnotation';
-  readonly memberType: UnionTypeAnnotationMemberType;
-}
+export type NativeModuleUnionTypeAnnotation =
+  UnionTypeAnnotation<NativeModuleUnionTypeAnnotationMemberType>;
 
 export interface NativeModuleMixedTypeAnnotation {
   readonly type: 'MixedTypeAnnotation';

packages/react-native-codegen/src/CodegenSchema.js

@@ -385,11 +385,6 @@ export type NativeModulePromiseTypeAnnotation = $ReadOnly<{
   elementType: VoidTypeAnnotation | Nullable<NativeModuleBaseTypeAnnotation>,
 }>;
 
-export type UnionTypeAnnotationMemberType =
-  | 'NumberTypeAnnotation'
-  | 'ObjectTypeAnnotation'
-  | 'StringTypeAnnotation';
-
 export type NativeModuleUnionTypeAnnotationMemberType =
   | NativeModuleObjectTypeAnnotation
   | StringLiteralTypeAnnotation
@@ -399,10 +394,8 @@ export type NativeModuleUnionTypeAnnotationMemberType =
   | StringTypeAnnotation
   | NumberTypeAnnotation;
 
-export type NativeModuleUnionTypeAnnotation = $ReadOnly<{
-  type: 'UnionTypeAnnotation',
-  memberType: UnionTypeAnnotationMemberType,
-}>;
+export type NativeModuleUnionTypeAnnotation =
+  UnionTypeAnnotation<NativeModuleUnionTypeAnnotationMemberType>;
 
 export type NativeModuleMixedTypeAnnotation = $ReadOnly<{
   type: 'MixedTypeAnnotation',