Remove use of tour in non profile and update tests

Problem/Motivation

\Drupal\Tests\help\Functional\HelpPageOrderTest uses the Tour module, which is being deprecated.
Also, \Drupal\Tests\toolbar\Functional\ToolbarCacheContextsTest.

There are other tests using tour but they are related to profiles or update tests. They are better done in a separate issue.

Steps to reproduce

Proposed resolution

HelpPageOrderTest - Use a test module instead of Tour.
\Drupal\Tests\toolbar\Functional\ToolbarCacheContextsTest - TBD

Remaining tasks

Decide what to do about Tour in \Drupal\Tests\toolbar\Functional\ToolbarCacheContextsTest
Review
Commit

User interface changes

API changes

Data model changes

Release notes snippet