refactor: migrate enrollment API calls from v1 to v2

[taimoor-ahmed-1]

Summary

Migrates both enrollment API call sites in Learning from /api/enrollment/v1/enrollment to /api/enrollment/v2/enrollment/, per the FC-0118 API standardization on openedx/edx-platform.

File	Verb	Screen
src/courseware/course/course-exit/data/api.js	GET	Course Exit — list enrollments for recommendations
src/alerts/enrollment-alert/data/api.js	POST	Enrollment Alert — enroll from the outline

The trailing slash on /enrollment/ is required: the v2 endpoint is served by a DRF DefaultRouter, and the POST caller would otherwise fail (Django won't redirect a POST across the missing slash).

Test URL assertions updated in CourseExit.test.jsx and OutlineTab.test.jsx.

Dependency

⚠️ Requires the Enrollment v2 API on the LMS (FC-0118, openedx/edx-platform PR #38724). Must be released before this is deployed.

Test plan

• npm test — CourseExit.test.jsx and OutlineTab.test.jsx pass with updated URL assertions
• Manual: recommendations on course exit + enroll-from-outline alert work against an LMS with v2 enabled

Closes #1936

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.41%. Comparing base (b931504) to head (5e99a69).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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  Coverage   91.41%   91.41%           
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  Files         347      347           
  Lines        5777     5777           
  Branches     1351     1385   +34     
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  Hits         5281     5281           
  Misses        477      477           
  Partials       19       19           

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