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Add aggregation across projects

Description

Add aggregation across projects

With this change, if the flag --all-projects is used,
a new file 'all.csv' will be created for the raw_daily
data as well as for each additional aggregator
(daily, weekly_rescaled, etc.). This file will contain
an aggregation across all projects.

Bug: T95339
Change-Id: Ieee012e60d2286e450779cabf253d6a1f11578b4