Update PagesCreated metric

* Make the namespace parameter include all namespaces if left blank
* Make a new parameter "Include Deleted" that counts deleted pages
  (looking at the archive table)
* Update corresponding labeling, UI, and tests

Bug: 71009

Change-Id: I5b3940e0946e90a35f17dade7ea3692f194bc523
Merge "Update PagesCreated metric"