feat: can_redeem checks for enrollment deadline

[iloveagent57]

Description:
We want the can_redeem query to return false for a given (user, content key)
if the enrollment deadline for the content key is in the past. This is necessary because
some courses have runs with an advertised run for which the deadline is in the future,
but also have available recent runs where the upgrade deadline is in the past.

Depends on openedx/enterprise-catalog#909 and openedx/enterprise-subsidy#286

A can_redeem false payload for a passed enroll by date will have a reasons value like this:

"reasons": [
            {
                "reason": "beyond_enrollment_deadline",
                "user_message": "You can't enroll right now because the enrollment deadline for this course has passed.",
                "policy_uuids": [
                    "3cc0ad2c-ede1-476c-8271-97683855e41d"
                ],
                "metadata": {
                    "enterprise_administrators": [
                        {
                            "email": "enterprise_admin_test-enterprise@example.com",
                            "lms_user_id": 145
                        }
                    ]
                }
            }
        ]

Jira:
ENT-7472

Merge checklist:

• ./manage.py makemigrations has been run
  • Note: This must be run if you modified any models.
    • It may or may not make a migration depending on exactly what you modified, but it should still be run.

Post merge:

• Ensure that your changes went out to the stage instance
• Deploy to prod instance

[iloveagent57]

In local testing, I noticed I wasn't getting any reasons in my test responses even when I can an expected can_redeem=False result. I tend to use reversals a lot to set up test state, so I have many unsuccessful redemptions.

[adamstankiewicz]

This seems reasonable!

[adamstankiewicz]

This seems reasonable!