ash: Updated desk related metric expirations

Updated and consolidated all Ash.Desks.NumberOfWindowsOnDesk_* to
have me as owner and the same expiration date.

Updated and consolidated ownership of *most* desk template related
metrics to have me as owner and the same expiration date.

BUG=b:347710400,b:349765032

Change-Id: I5929d9cd008d27686ed657d822ae801ad008c7a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5747235
Reviewed-by: Michele Fan <michelefan@chromium.org>
Commit-Queue: Daniel Andersson <dandersson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1334501}