fix: adjust gradebook URL to correct value

[dwong2708]

Description

The get_gradebook_url method in CourseInformationSerializerV2 was building the gradebook URL incorrectly in two ways:

1. It was appending a hardcoded /gradebook/ path segment, but the WRITABLE_GRADEBOOK_URL setting is already expected to include that path. The correct URL should be {WRITABLE_GRADEBOOK_URL}/{course_key}.

2. It was reading WRITABLE_GRADEBOOK_URL directly from settings instead of going through configuration_helpers.get_value, which meant site-level configuration overrides were being ignored.

Testing instructions

1. Set WRITABLE_GRADEBOOK_URL to the full gradebook MFE base URL including the path (e.g. http://localhost:1994/gradebook).
2. Enable the writable gradebook waffle flag for a course.
3. Call the CourseMetadataView API endpoint for that course.
4. Verify the gradebook_url in the response is http://localhost:1994/gradebook/<course_key>.

Deadline

Verawood

[openedx-webhooks]

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[Copilot]

Pull request overview

This PR fixes how the Instructor API v2 exposes the writable Gradebook MFE URL for a course, aligning it with the expected WRITABLE_GRADEBOOK_URL format and ensuring SiteConfiguration overrides are respected.

Changes:

• Update WRITABLE_GRADEBOOK_URL usage to stop appending a hardcoded /gradebook/ segment and instead append only /<course_key>.
• Retrieve WRITABLE_GRADEBOOK_URL via configuration_helpers.get_value to honor site-level overrides.
• Adjust devstack default and extend API v2 tests to validate the returned gradebook_url.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
lms/envs/devstack.py	Updates devstack WRITABLE_GRADEBOOK_URL to include the /gradebook path segment.
lms/djangoapps/instructor/views/serializers_v2.py	Fixes Gradebook URL construction and switches to SiteConfiguration-aware lookup.
lms/djangoapps/instructor/tests/test_api_v2.py	Adds assertions/decorators to validate gradebook_url in course metadata response.

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