Support choose email when creating a commit via web UI (#33432)

Initial PR for #24469

services/repository/files/upload.go

@@ -128,12 +128,15 @@ func UploadRepoFiles(ctx context.Context, repo *repo_model.Repository, doer *use
 		return err
 	}
 
-	// make author and committer the doer
-	author := doer
-	committer := doer
-
 	// Now commit the tree
-	commitHash, err := t.CommitTree(opts.LastCommitID, author, committer, treeHash, opts.Message, opts.Signoff)
+	commitOpts := &CommitTreeUserOptions{
+		ParentCommitID: opts.LastCommitID,
+		TreeHash:       treeHash,
+		CommitMessage:  opts.Message,
+		SignOff:        opts.Signoff,
+		DoerUser:       doer,
+	}
+	commitHash, err := t.CommitTree(commitOpts)
 	if err != nil {
 		return err
 	}