Promote Terminal.creationOptions to stable

The API did not have a proposed API guard in place

Fixes #63052

Author: Tyriar

src/vs/vscode.d.ts

@@ -4854,6 +4854,13 @@ declare module 'vscode' {
 		 */
 		readonly processId: Thenable<number | undefined>;
 
+		/**
+		 * The object used to initialize the terminal, this is useful for example to detecting the
+		 * shell type of when the terminal was not launched by this extension or for detecting what
+		 * folder the shell was launched in.
+		 */
+		readonly creationOptions: Readonly<TerminalOptions | ExtensionTerminalOptions>;
+
 		/**
 		 * Send text to the terminal. The text is written to the stdin of the underlying pty process
 		 * (shell) of the terminal.

src/vs/vscode.proposed.d.ts

@@ -987,19 +987,6 @@ declare module 'vscode' {
 
 	//#endregion
 
-	//#region Terminal creation options https://github.com/microsoft/vscode/issues/63052
-
-	export interface Terminal {
-		/**
-		 * The object used to initialize the terminal, this is useful for things like detecting the
-		 * shell type of shells not launched by the extension or detecting what folder the shell was
-		 * launched in.
-		 */
-		readonly creationOptions: Readonly<TerminalOptions | ExtensionTerminalOptions>;
-	}
-
-	//#endregion
-
 	//#region Terminal dimensions property and change event https://github.com/microsoft/vscode/issues/55718
 
 	/**