Updates the new bootstrap course home page to match the old course home page.

This reverts commit b541dfa3.

This reverts commit a1359535, reversing
changes made to 68d5fe89.

WL-1279

LEARNER-1923

Moves ENABLE_ENTERPRISE_INTEGRATION to settings.FEATURES,
and changes the default value to False.

LEARNER-2860

Implement a course dates fragment as a web view, currently we are using
the course info page to get the course dates section by parsing the
whole html page.

LEARNER-2769

ENT-704

LEARNER-2819

Separate the date and link logic out of VerifiedUpgradeDeadlineBlock, so that it can be called directly with prefetched data for check_and_get_upgrade_link_and_date

ENT-704

LEARNER-2412

LEARNER-1694

Fix a11y failure

Fix header styling

Fix layout issues

Further layout fixes

LEARNER-2308

Once a goal has been set for a user on the course home message,
allow them to update it on the course home side bar. Automatically
sets a course goal for users when enrolling in a verifiable course.

- Convert hero events to BI events.
- Upgrade click event clean-up

LEARNER-2026

LEARNER-2332

Since CourseTalk doesn't allow for loading a read and write reviews
page at the same time, this commit adds a loading icon to show that
we need to grab the iframe.

Revert changes for getting enterprise customer from enteprise from
Enterprise API and update/add test.
Lookup the enterprise_customer_uuid based on the site and user if not
found through the cookie or request parameter.

LEARNER-2073

ENT-624

LEARNER-2236

Remove the profile from the user dropdown.

LEARNER-2318

Certs are displayed by default to everyone.