Add Default Pull Request Title (#5735)
Add Default Pull Request Title (#5735)

* add default PR title
Set default PR title to commit summary if there's a single commit on the head branch, else set it to the head branch name

* set default PR description
If there's a single commit on the head branch, and it's multiline, then set it as the default PR description

go-gitea/gitea,vdbt/gitea,sapk-fork/gitea,kubatyszko/gitea,go-gitea/gitea,kubatyszko/gitea,cez81/gitea,cez81/gitea,vdbt/gitea,sapk-fork/gitea,typeless/gitea,sapk-fork/gitea,kubatyszko/gitea,cez81/gitea,go-gitea/gitea,lafriks/gitea,sapk-fork/gitea,lafriks/gitea,typeless/gitea,typeless/gitea,vCaesar/gitea,typeless/gitea,lafriks/gitea,vCaesar/gitea