Make Terminal.exitStatus stable API

Fixes #62103

src/vs/vscode.d.ts

@@ -4930,6 +4930,21 @@ declare module 'vscode' {
 		 */
 		readonly creationOptions: Readonly<TerminalOptions | ExtensionTerminalOptions>;
 
+		/**
+		 * The exit status of the terminal, this will be undefined while the terminal is active.
+		 *
+		 * **Example:** Show a notification with the exit code when the terminal exits with a
+		 * non-zero exit code.
+		 * ```typescript
+		 * window.onDidCloseTerminal(t => {
+		 *   if (t.exitStatus && t.exitStatus.code) {
+		 *   	vscode.window.showInformationMessage(`Exit code: ${t.exitStatus.code}`);
+		 *   }
+		 * });
+		 * ```
+		 */
+		readonly exitStatus: TerminalExitStatus | undefined;
+
 		/**
 		 * Send text to the terminal. The text is written to the stdin of the underlying pty process
 		 * (shell) of the terminal.
@@ -7746,6 +7761,20 @@ declare module 'vscode' {
 		readonly rows: number;
 	}
 
+	/**
+	 * Represents how a terminal exited.
+	 */
+	export interface TerminalExitStatus {
+		/**
+		 * The exit code that a terminal exited with, it can have the following values:
+		 * - Zero: the terminal process or custom execution succeeded.
+		 * - Non-zero: the terminal process or custom execution failed.
+		 * - `undefined`: the user forcibly closed the terminal or a custom execution exited
+		 *   without providing an exit code.
+		 */
+		readonly code: number | undefined;
+	}
+
 	/**
 	 * A location in the editor at which progress information can be shown. It depends on the
 	 * location how progress is visually represented.

src/vs/vscode.proposed.d.ts

@@ -1025,38 +1025,6 @@ declare module 'vscode' {
 
 	//#endregion
 
-	//#region Terminal exit status https://github.com/microsoft/vscode/issues/62103
-
-	export interface TerminalExitStatus {
-		/**
-		 * The exit code that a terminal exited with, it can have the following values:
-		 * - Zero: the terminal process or custom execution succeeded.
-		 * - Non-zero: the terminal process or custom execution failed.
-		 * - `undefined`: the user forcibly closed the terminal or a custom execution exited
-		 *   without providing an exit code.
-		 */
-		readonly code: number | undefined;
-	}
-
-	export interface Terminal {
-		/**
-		 * The exit status of the terminal, this will be undefined while the terminal is active.
-		 *
-		 * **Example:** Show a notification with the exit code when the terminal exits with a
-		 * non-zero exit code.
-		 * ```typescript
-		 * window.onDidCloseTerminal(t => {
-		 *   if (t.exitStatus && t.exitStatus.code) {
-		 *   	vscode.window.showInformationMessage(`Exit code: ${t.exitStatus.code}`);
-		 *   }
-		 * });
-		 * ```
-		 */
-		readonly exitStatus: TerminalExitStatus | undefined;
-	}
-
-	//#endregion
-
 	//#region Terminal dimensions property and change event https://github.com/microsoft/vscode/issues/55718
 
 	/**