Missing schema tags for courses

Thank you for the merge request, we'll try to review it soon.

As a reminder, when you're finished with your work please set the "Assigned" field to "Unassigned".

Rebased with 3.0.x branch to run the CI pipeline.

Got warnings for offers and hasCourseInstance

Here an issue has been logged for hasCourseInstance
https://www.drupal.org/project/schema_metatag/issues/3410151 ✨ Missing field 'hasCourseInstance' Active

Looks pretty good, but it needs a test file to make sure the functionality works.

Hello,

I have the same problem with :
Missing "offers" fields :
Missing "HasCourseInstance" fields :
Have you found a way to fix this?

bram.velthoven → made their first commit to this issue’s fork.

@Arono_ I've comitted to the MR and added the course tags HasCourseInstance and Offers

I have had a quick review and suspect that while this may quieten google from complaining, it not be that useful.

According to: https://schema.org/hasCourseInstance
"hasCourseInstance" should be of "@type": "CourseInstance". Also I suspect there should be a way to set some other variables here as well.

The courseInstance should also be repeatable according to:
https://developers.google.com/search/docs/appearance/structured-data/cou...

This suggests at the very least the definition should look a bit more like:

 *   multiple = TRUE,
 *   property_type = "type",
 *   tree_parent = {
 *     "CourseInstance",
 *   },

I have added the new items to the config/schema file as I think they may have been missed.
Tweaked the annotations to fix some typos left over from a copy process.
Added a new PropertyType for courseInstance and also updated the SchemaCourseOffers to allow multiples of the offer property.
The new course instance has the bits I need for now, but could be updated easily to add more as defined by: