Remove unused SendAccessibilityEvent class (#50478)

Summary:
Found this unused class with static code analysis. It is internal and has no OSS usages, so it seems like it can be safely deleted.

## Changelog:

[INTERNAL] - Remove unused com.facebook.react.fabric.mounting.mountitems.SendAccessibilityEvent class

Pull Request resolved: #50478

Test Plan:
```sh
yarn test-android
yarn android
```

Reviewed By: fabriziocucci

Differential Revision: D72445544

Pulled By: javache

fbshipit-source-id: ebbb035da22111e41b04131596d3ec61d4e1423c

Author: mateoguzmana

packages/core-cli-utils/package.json

@@ -10,7 +10,7 @@
     "directory": "packages/core-cli-utils"
   },
   "exports": {
-    ".": "./src/index.js",
+    ".": "./src/index.flow.js",
     "./package.json": "./package.json",
     "./version.js": "./src/public/version.js"
   },
@@ -28,4 +28,4 @@
   ],
   "dependencies": {},
   "devDependencies": {}
-}
+}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/SendAccessibilityEvent.kt

@@ -2564,84 +2564,84 @@ SPEC CHECKSUMS:
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