Add missing LogBox method declarations to LogBox.d.ts (#57472)

Summary:
Pull Request resolved: #57472

`LogBox.d.ts` declared only `ignoreLogs`, `ignoreAllLogs`, `install`, and `uninstall`, but the runtime `LogBox` object also exposes `isInstalled()` and `clearAllLogs()`. Add these two signatures so TypeScript consumers can call them without casting.

Changelog:
[General][Added] - Add `isInstalled()` and `clearAllLogs()` to the `LogBox` TypeScript declarations

Reviewed By: christophpurrer

Differential Revision: D110930249

fbshipit-source-id: a7b739266ebf02297797b47ff6931652a359d1cf

Author: Abbondanzo

packages/react-native/Libraries/LogBox/LogBox.d.ts

@@ -22,6 +22,17 @@ export interface LogBoxStatic {
 
   install(): void;
   uninstall(): void;
+
+  /**
+   * Whether LogBox is currently installed.
+   */
+  isInstalled(): boolean;
+
+  /**
+   * Clear all logs and dismiss the LogBox surface. Invoked by the Fast Refresh
+   * pipeline on each applied update.
+   */
+  clearAllLogs(): void;
 }
 
 export const LogBox: LogBoxStatic;