Gathers information about changes merged and reviewed for team weekly reports.
Change-Id: I53e3acc45679b4822c506d16980393fbaf337b3b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/59022
Auto-Submit: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>