Add tracking for P and Q number links in the summary
This is to be done before the label changes, so we can track the change in the number of clicks.
We want to check the levels here for at least 1 week before deploying the labels commit, to compare before/after
This is metric M1 from https://phabricator.wikimedia.org/T386200
Acceptance criteria:
- The number of clicks per day for P and Q links in the summary is tracked