Increase the course run short description override db limit to count
for foreign characters.

LEARNER-4673

[LEARNER-4061]

We weren't propagating entitlement type/price changes to existing
seat products.

LEARNER-4347

The feature has fully landed. We just want it always on now.

LEARNER-4152

In the frontend, TinyMC is removing `\n` `&nbsp` which backend wasn't causing mismatch between the counts. Now updated the backend to use `get_text(strip=True)` method which will remove these from the text.

Revert "EDUCATOR-2231 Drop the enrollment start and end date fields from publisher course runs model"

This reverts commit d5a6bea1.

When publishing, we want to give ecommerce the UUID of the course
so that it doesn't have to turn around and ask us for that same bit
of information.

This reverts commit e4eaf0d5.

LEARNER-3770

When publishing a course run to ecommerce and discovery, also push
any entitlements for its course to those same services.

This reverts commit 3db5a5ef which was
itself a reversion to back out these changes while we fixed our staging
services.

LEARNER-4031

When creating a course run in the Publisher dashboard, only allow the
user to create runs for courses they have access to.

LEARNER-4102