fixes#22907
Tested:
- [x] issue content edit
- [x] issue content change tasklist
- [x] pull request content edit
- [x] pull request change tasklist

(cherry picked from commit aa92b13164e84c26be91153b6022220ce0a27720)
Conflicts:
models/issues/comment.go
c7a389f2b2 [FEAT] allow setting the update date on issues and comments
options/locale/locale_en-US.ini
trivial context conflicts
routers/api/v1/repo/issue_comment.go
routers/api/v1/repo/issue_comment_attachment.go
services/issue/comments.go
services/issue/content.go
user blocking is implemented differently in Forgejo
routers/web/repo/issue.go
trivial difference from 6a0750177f Allow to save empty comment
user blocking is implemented differently in Forgejo
templates/repo/issue/view_content/conversation.tmpl
templates changed a lot in Forgejo but the change is
trivially ported
tests/integration/issue_test.go
other tests were added in the same region
web_src/js/features/repo-issue-edit.js
the code is still web_src/js/features/repo-legacy.js
trivially ported