Issue #3285082: Add Automated Testing Coverage For Varbase Tour Module

tests/features/varbase/01-website-base-requirements/01-00-varbase-welcome-tour.feature

+Feature: The welcome message should be displayed on first visit to the site
+The welcome message is made possible by having Varbase Tour module
+
+  @javascript @local @development @staging @production
+  Scenario: Check if welcome message is enabled
+    Given I am a logged in user with the "webmaster" user
+      And I go to "admin/config/varbase/settings"
+     Then I should see "Varbase general settings"
+      And I should see "Allow site to show welcome message"
+      And I check the box "Allow site to show welcome message"
+      And I press "Save configuration"
+      And I wait
+     Then I should see "The configuration options have been saved."
+
+  @javascript @local @development @staging @production
+  Scenario: Check if welcome message and tour are displayed
+    Given I am a logged in user with the "webmaster" user
+      And I go to "?welcome"
+     Then I should see "Welcome to "
+      And I should see " Get started "
+     When I click "Get started"
+      And I wait 2s
+     Then I should see "Tour Switch"
+     When I click "Next" in the "button" element with the "class" attribute set to "button button--primary shepherd-button "
+     Then I should see "Editing Your Homepage Layout"
+     When I click "Next" in the "button" element with the "class" attribute set to "button button--primary shepherd-button "
+     Then I should see "Start Configuring Your Site Structure"
+     When I click "Next" in the "button" element with the "class" attribute set to "button button--primary shepherd-button "
+     Then I should see "Define Your Site Settings"
+     When I click "Next" in the "button" element with the "class" attribute set to "button button--primary shepherd-button "
+     Then I should see "Site Content"
+      And I should see "End tour"
+      And I press the "End tour" button
+     Then I should see "Welcome to Varbase"
+
+  @javascript @local @development @staging @production
+  Scenario: Check if welcome message is disabled after closing it
+    Given I am a logged in user with the "webmaster" user
+      And I go to "admin/config/varbase/settings"
+     Then I should see "Varbase general settings"
+      And I should see "Allow site to show welcome message"
+      And the "Allow site to show welcome message" checkbox is unchecked