Store the API ID for canvas courses on LMSCourse

[marcospri]

For:

• Store API IDs alongside LTI ones for users and courses #6880

Course have a LTI identifier that it's send on every launch but also have a API only ID that's needed to talk to the proprietary API of each LMS.

We do store the canvas version of this ID in a json dict in Grouping.extra but this train of PR promotes it to its own column.

Testing

• Apply the migration
  tox -e dev --run-command 'alembic upgrade head'

• Log into canvas (eng+canvasteacher@hypothes.is) and launch:

https://hypothesis.instructure.com/courses/125/assignments/875

• Check the correct value (125) is present on lms_course now, in make sql:

select * from lms_course where lms_api_course_id = '125';


-[ RECORD 1 ]---------------+----------------------------------------------------
id                          | 1056
tool_consumer_instance_guid | VCSy8DAKCFIQYaItpSGyXhOXIlk5A6NWduVVG1u3:canvas-lms
lti_context_id              | f3cd019017839c4630358662a05540f2f6ec5f93
h_authority_provided_id     | 653e9620a656a954c684942f6443fa3e3410c03a
copied_from_id              | 
name                        | Developer Test Course with Sections Enabled
created                     | 2025-01-07 10:57:47.775449
updated                     | 2025-01-08 13:01:36.984534
lti_context_memberships_url | 
starts_at                   | 
ends_at                     | 
lms_api_course_id           | 125

[marcospri]

This was a test case missing from a previous PR.

We need to test that invalid dates are also handled. Coverage doesn't catch it because it's handled in the same line as the None case.

Added it here in a separate commit.