vscode.debug.onDidTerminateDebugSession never calls listener

[Bolodya1997]

Bug Description:

vscode.debug.onDidTerminateDebugSession never calls assigned listener.

Steps to Reproduce:

1. Create test plugin:

import * as vscode from "vscode";
import { ExtensionContext, window } from "vscode";

export async function activate(_: ExtensionContext) {
  vscode.debug.onDidStartDebugSession((session: vscode.DebugSession) => {
    window.showInformationMessage(`Started debug session: ${session.id}`);
  });

  vscode.debug.onDidTerminateDebugSession((session: vscode.DebugSession) => {
    window.showInformationMessage(`Terminated debug session: ${session.id}`);
  });
}

3. Run Theia with any language supported (tested with Python) with test plugin added.
4. Create any debug configuration.
   
5. Run debug session.
   

Expected behavior

1. Information message 'Started debug session' is shown on execution start.
2. Information message 'Terminated debug session' is shown on execution end.

Actual behavior

1. Only 'Started debug session' message is shown.

Additional Information

• Operating System: Mac OS Catalina 10.15.7
• Browser: Google Chrome 99.0.4844.83
• Theia Version: latest (v1.23.0)