feat: add CoursewareViewRedirectURL pipeline steps

[pwnage101]

This commit replaces most enterprise-specific logic serving the purpose
of conditionally blocking courseware access.

Enterprise steps added:

• EnterpriseStartDateAccessFailureStep supplies an enterprise-specific start-date error for enterprise learners.
• ActiveEnterpriseCheckStep denies access when the learner's active EnterpriseCustomer differs from the enrollment's customer.

Consent steps added:

• DataSharingConsentRedirectStep supplies a redirect URL to collect data sharing consent when it is required.
• DataSharingConsentCourseAccessStep denies access when consent is required.

ENT-11544

---

Blocked by:

• feat: add CoursewareViewStarted, CourseStartDateValidationFailed, and CoursewareAccessChecksRequested filters openedx-filters#336

Blocks:

• feat: decouple enterprise from courseware view redirects edx/edx-platform#338
• feat: decouple enterprise from course start-date validation edx/edx-platform#339
• feat: decouple enterprise from course access checks edx/edx-platform#340
• feat: decouple enterprise from courseware view redirects, course start-date validation, and course access checks openedx-platform#38102

[codecov]

Codecov Report

❌ Patch coverage is 62.06897% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.00%. Comparing base (306ca8a) to head (b4c83bf).

Files with missing lines	Patch %	Lines
consent/helpers.py	50.00%	11 Missing ⚠️

❌ Your patch check has failed because the patch coverage (62.06%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2548      +/-   ##
==========================================
- Coverage   86.04%   86.00%   -0.04%     
==========================================
  Files         250      251       +1     
  Lines       16700    16740      +40     
  Branches     1657     1662       +5     
==========================================
+ Hits        14369    14397      +28     
- Misses       1997     2008      +11     
- Partials      334      335       +1     

Flag	Coverage Δ
unittests	86.00% <62.06%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull request overview

This PR introduces new openedx-filters pipeline steps in enterprise and consent to enforce enterprise-specific courseware access gating (enterprise start-date messaging, active-enterprise mismatch blocking, and data-sharing consent redirects/blocks), and adds unit tests to validate the new behaviors.

Changes:

• Added Enterprise courseware filter steps for start-date override errors and active-enterprise mismatch access denial.
• Added Consent courseware filter steps plus helper logic to compute enterprise consent redirect URLs / access blocks.
• Added/expanded tests covering new enterprise/consent helpers and courseware filter pipeline steps.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/test_enterprise/test_utils.py	Adds tests for get_active_enterprise_customer_user.
tests/test_consent/test_helpers.py	Adds unit tests for consent helper behavior and URL building.
tests/test_consent/test_filters_courseware.py	Adds tests for consent courseware filter steps (redirect + access denial).
tests/filters/test_courseware.py	Adds tests for enterprise courseware filter steps (start-date override + active enterprise check).
enterprise/utils.py	Adds get_active_enterprise_customer_user and enterprise_learner_enrolled.
enterprise/settings/common.py	Registers enterprise courseware pipeline steps in filters config.
enterprise/filters/dashboard.py	Updates migration-related comment wording.
enterprise/filters/courseware.py	Adds enterprise courseware pipeline steps.
consent/settings/common.py	Registers consent courseware pipeline steps in filters config.
consent/helpers.py	Adds consent enforcement logic and consent URL builder helpers.
consent/filters/courseware.py	Adds consent courseware pipeline steps.
consent/filters/init.py	Adds package docstring for consent filter steps.