fix: [pages] Deploy pages only for the default branch

This means only published mofications will be served
3 jobs for topic/default/pages_default in 6 minutes and 46 seconds (queued for 10 minutes and 23 seconds)
Status Job ID Name Coverage
  Test
passed cubes_qa #50332

00:05:46

passed mr_center #50330

00:02:21

passed pipelines_status #50331

00:02:37