Comments on merge request missing when importing from gitea

The import of comments on Merge Request during gitea import have been removed by MR gitlab-foss!29521 (merged) as it was producing an error (This limitation was just added to the documentation in !147305 (merged) )

It appears that if gitea has no API endpoint for comments on Merge Request it's because the endpoint on Issue is able to also provide comments on MR.

As a result, issue can be fixed by !145244 (closed)

Proposed solution

As stated in the issue description, it looks like issues_comments in Gitea endpoint has PR comments that we can utilize to import PR comments.