feat: add exec ed course uuid to learner home serializer

[jono-booth]

Description

Adds a courseUuid field to the Learner Home CourseRunSerializer, populated only for Executive Education (GetSmarter/Titan) enrollments — modes executive-education, paid-executive-education, unpaid-executive-education. For every other enrollment it's null and the catalog service is never queried.

This is step 1 of a 3-repo change for ENT-9254 (see below). Today, a learner clicking "Start Course" on their edx.org dashboard for an enrolled ExecEd/GetSmarter presentation lands on a generic Titan/GetSmarter profile page and has to click "View Course" a second time to reach the OLC (Online Learning Campus). Titan can skip that extra hop and redirect straight into the OLC if it's given an identifier for the course — but edx-platform currently has no such identifier anywhere in the dashboard payload.

courseUuid reuses the existing get_course_uuid_for_course() catalog utility (already used by common.djangoapps.entitlements) to resolve the course's discovery Course.uuid, which is expected to match Titan's Spree::Product.course_uuid (to be confirmed with the GetSmarter/Titan team before it's relied upon downstream).

• Which edX user roles will this change impact? Learner — Executive Education learners only. No behavior change for any other course.

Supporting information

• Jira: ENT-9254 — EdX-ExecEd Dashboard redirect to OLC without stopping in Titan

Planned follow-ups (not in this PR):

1. frontend-app-learner-dashboard: extend useCardExecEdTrackingParam to append courseUuid as a course_id query param on the "Start/Resume Course" link, alongside the existing org_id.
2. titan: read that param in Spree::UsersControllerDecorator#show and redirect straight to partner_olc_link(product) instead of rendering the profile page, when it matches an allocation.

This PR is safe to merge standalone — it only adds a new, additively-gated field to an existing API response; nothing consumes it yet.

Testing instructions

1. Enroll a test user in a course with an Executive Education mode (executive-education, paid-executive-education, or unpaid-executive-education).
2. Hit the Learner Home API (/api/learner_home/init or equivalent) and confirm the corresponding courseRun entry has a non-null courseUuid.
3. Confirm a normal (audit/verified/etc.) enrollment's courseRun.courseUuid is null.

Covered by new/updated unit tests in lms/djangoapps/learner_home/test_serializers.py:

• test_with_data (updated to exercise an Executive Education enrollment)
• test_course_uuid_only_populated_for_executive_education (new — asserts None + no catalog call for non-ExecEd, and the resolved UUID for ExecEd)

Deadline

None.

Other information

• Depends on nothing merged elsewhere; the frontend and Titan follow-ups depend on this.
• No database migration.
• No new external calls for the common case — the catalog lookup only fires for Executive Education enrollments.

[Copilot]

Pull request overview

This PR extends the Learner Home CourseRunSerializer API response to include a courseUuid value (sourced from the Catalog service) for Executive Education (GetSmarter/Titan) enrollments, enabling the frontend to construct Titan redirect URLs with the needed catalog identifier.

Changes:

• Added a courseUuid serializer method field, populated only for Executive Education enrollment modes.
• Introduced an EXECUTIVE_EDUCATION_MODES allowlist to gate when the catalog lookup occurs.
• Updated and expanded serializer tests to verify the field is populated only for Executive Education modes and that non-ExecEd modes do not query the catalog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lms/djangoapps/learner_home/serializers.py	Adds courseUuid to CourseRunSerializer, conditionally fetching the catalog UUID for ExecEd modes only.
lms/djangoapps/learner_home/test_serializers.py	Updates tests to cover ExecEd/non-ExecEd behavior and ensures catalog lookup is avoided when not needed.

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