Support migrating GitHub/GitLab PR draft status (#32242)

Resolve #32196

(cherry picked from commit 74664b08a004393ce013e872e47901f52645b65a)

modules/migration/pullrequest.go

@@ -37,6 +37,7 @@ type PullRequest struct {
 	ForeignIndex   int64
 	Context        DownloaderContext `yaml:"-"`
 	EnsuredSafe    bool              `yaml:"ensured_safe"`
+	IsDraft        bool              `yaml:"is_draft"`
 }
 
 func (p *PullRequest) GetLocalIndex() int64          { return p.Number }

services/migrations/gitea_uploader.go

@@ -760,10 +760,15 @@ func (g *GiteaLocalUploader) newPullRequest(pr *base.PullRequest) (*issues_model
 		pr.Updated = pr.Created
 	}
 
+	prTitle := pr.Title
+	if pr.IsDraft && !issues_model.HasWorkInProgressPrefix(pr.Title) {
+		prTitle = fmt.Sprintf("%s %s", setting.Repository.PullRequest.WorkInProgressPrefixes[0], pr.Title)
+	}
+
 	issue := issues_model.Issue{
 		RepoID:      g.repo.ID,
 		Repo:        g.repo,
-		Title:       pr.Title,
+		Title:       prTitle,
 		Index:       pr.Number,
 		Content:     pr.Content,
 		MilestoneID: milestoneID,

services/migrations/github.go

@@ -737,6 +737,7 @@ func (g *GithubDownloaderV3) GetPullRequests(page, perPage int) ([]*base.PullReq
 			PatchURL:     pr.GetPatchURL(), // see below for SECURITY related issues here
 			Reactions:    reactions,
 			ForeignIndex: int64(*pr.Number),
+			IsDraft:      pr.GetDraft(),
 		})
 
 		// SECURITY: Ensure that the PR is safe

services/migrations/gitlab.go

@@ -723,6 +723,7 @@ func (g *GitlabDownloader) GetPullRequests(page, perPage int) ([]*base.PullReque
 			PatchURL:     pr.WebURL + ".patch",
 			ForeignIndex: int64(pr.IID),
 			Context:      gitlabIssueContext{IsMergeRequest: true},
+			IsDraft:      pr.Draft,
 		})
 
 		// SECURITY: Ensure that the PR is safe