Add rebase push display wrong comments bug (#35560)

Fix #35518

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/pull/comment.go

@@ -63,6 +63,7 @@ func CreatePushPullComment(ctx context.Context, pusher *user_model.User, pr *iss
 	var data issues_model.PushActionContent
 	if opts.IsForcePush {
 		data.CommitIDs = []string{oldCommitID, newCommitID}
+		data.IsForcePush = true
 	} else {
 		data.CommitIDs, err = getCommitIDsFromRepo(ctx, pr.BaseRepo, oldCommitID, newCommitID, pr.BaseBranch)
 		if err != nil {

services/pull/pull.go

@@ -243,6 +243,17 @@ func ChangeTargetBranch(ctx context.Context, pr *issues_model.PullRequest, doer
 		}
 	}
 
+	exist, err := git_model.IsBranchExist(ctx, pr.BaseRepoID, targetBranch)
+	if err != nil {
+		return err
+	}
+	if !exist {
+		return git_model.ErrBranchNotExist{
+			RepoID:     pr.BaseRepoID,
+			BranchName: targetBranch,
+		}
+	}
+
 	// Check if branches are equal
 	branchesEqual, err := IsHeadEqualWithBranch(ctx, pr, targetBranch)
 	if err != nil {