feat: add variant_id to seat info for ExecEd courses

[AfaqShuaib09]

Description

In continue to the PR: #3794
This PR adds the functionality to add variant_id to seat_info for execEd courses via publication endpoint

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[DawoudSheraz]

Codewise, it looks alright. I am going to rely on owner and/or Enterprise for better context here.

[zawan-ila]

Have you verified that this works as intended? I believe you need to define the new attribute variant_id on the Seat product to ensure it gets into the database? As it stands, I do not think the attribute is really being set in the db 🤔

[zawan-ila]

If I am correct here^, I expect we'll need something like 3782

[AfaqShuaib09]

Have you verified that this works as intended? I believe you need to define the new attribute variant_id on the Seat product to ensure it gets into the database? As it stands, I do not think the attribute is really being set in the db 🤔

Not this time, but during my work on this pull request, I had tested these changes with the value of course_metadata.is_course_run_variant_id_ecommerce_consumable set to true, and everything was functioning correctly.

[thinking] It seems like it is currently adding variant_id Product Attribute that is linked with Course Entitlements for seats Products as well. Otherwise it'll raise error in unittest too.
I believe it would be better to add it separately for Seat Product Type, just as you mentioned, as shown below for other Product Attributes:

Nice catch 💯