add support for exporting and importing props (#14034)

* add support for exporting and importing props

* merge master

* add export test for post props

* add check if postData exists

* add import tests for post props

* fix ci bot issues

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* fix gofmt errors

* remove test comment and add name instead

* remove uneccessary changes

Co-authored-by: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

app/import_functions.go

@@ -1111,6 +1111,10 @@ func (a *App) importMultiplePosts(data []*PostImportData, dryRun bool) *model.Ap
 		post.CreateAt = *postData.CreateAt
 		post.Hashtags, _ = model.ParseHashtags(post.Message)
 
+		if postData.Props != nil {
+			post.Props = *postData.Props
+		}
+
 		fileIds, err := a.uploadAttachments(postData.Attachments, post, team.Id, dryRun)
 		if err != nil {
 			return err
@@ -1382,6 +1386,10 @@ func (a *App) importMultipleDirectPosts(data []*DirectPostImportData, dryRun boo
 		post.CreateAt = *postData.CreateAt
 		post.Hashtags, _ = model.ParseHashtags(post.Message)
 
+		if postData.Props != nil {
+			post.Props = *postData.Props
+		}
+
 		fileIds, err := a.uploadAttachments(postData.Attachments, post, "noteam", dryRun)
 		if err != nil {
 			return err