MM-57512: Disable content extraction during import (#26619)

https://mattermost.atlassian.net/browse/MM-57512
```release-note
NONE
```

server/channels/app/post_metadata_test.go

@@ -181,7 +181,7 @@ func TestPreparePostForClient(t *testing.T) {
 		th := setup(t)
 		defer th.TearDown()
 
-		fileInfo, err := th.App.DoUploadFile(th.Context, time.Now(), th.BasicTeam.Id, th.BasicChannel.Id, th.BasicUser.Id, "test.txt", []byte("test"))
+		fileInfo, err := th.App.DoUploadFile(th.Context, time.Now(), th.BasicTeam.Id, th.BasicChannel.Id, th.BasicUser.Id, "test.txt", []byte("test"), true)
 		fileInfo.Content = "test"
 		fileInfo.ChannelId = th.BasicChannel.Id
 		require.Nil(t, err)
@@ -599,7 +599,7 @@ func TestPreparePostForClient(t *testing.T) {
 		th := setup(t)
 		defer th.TearDown()
 
-		fileInfo, err := th.App.DoUploadFile(th.Context, time.Now(), th.BasicTeam.Id, th.BasicChannel.Id, th.BasicUser.Id, "test.txt", []byte("test"))
+		fileInfo, err := th.App.DoUploadFile(th.Context, time.Now(), th.BasicTeam.Id, th.BasicChannel.Id, th.BasicUser.Id, "test.txt", []byte("test"), true)
 		require.Nil(t, err)
 
 		post, err := th.App.CreatePost(th.Context, &model.Post{