[Login popup] Verify that user can enter personal cabinet with Google account login function

**Priority:** medium

**Description:** This test verifies that a registered user can enter his personal cabinet with Google account login function

**Preconditions** user is already registered on https://s2s-front-stage.azurewebsites.net/ website

**Steps to reproduce**
1. Click Login button in the upper right corner of the header
2. Click Sign in with Google account button
3. Click valid Google account

**Expected result:**
The access to the personal cabinet should be given

Epic: #32

Start at the staging URL and follow the listed login flow: open the Login popup, choose Sign in with Google account, and select a valid Google account. Done means the registered user is granted access to the personal cabinet; the issue does not name a file or automated test to run.

Written by the indexing model from the issue text.