fix: commentable_ids should be list of ids rather then a comma separated string

[xitij2000]

This along with upgrading the openedx-forum package to v0.3.2 or above will fix the issue where in-context discussions are not filtered to the current unit.

note: this can be dropped when upgrading to teak

Testing instructions:

• Create a tutor Sumac environment .
• Create new discussion topics under different units.
• They should all show up when you navigate to any unit.
• Switch the sumac environment to this branch and upgrade the openedx-forum package to v0.3.2
• Check that the discussion topics in each unit correspond to the current unit.

private ref: https://tasks.opencraft.com/browse/BB-10387

[farhaanbukhsh]

👍

✅ I tested this on the sandbox

• Created a post in one unit
• Tested that it isn't visible in any other unit
  ✅ I read through the code
  ❌ I checked for accessibility issues
  ❌ Includes documentation

[samuelallan72]

@xitij2000 @farhaanbukhsh was there a reason this wasn't merged in the end?

Also, given the comment in the description:

note: this can be dropped when upgrading to teak

I guess we don't need this any more. I'll close this for now, since the linked ticket is closed and this seems no longer relevant.

[xitij2000]

@samuelallan72 This wasn't merged because the client was using a different branch and fixing it here wasn't important since it was already fixed in teak and most clients were already using that.

[samuelallan72]

Thanks for confirming @xitij2000 :)