Register Create Account From Improvements V1 experiment and add metrics

Large parts of the query logic for the "Fraction of account creations with email"-metric have been written with the heavy advice from claude and looking at some other examples in this file because I don't really understand what this is doing and do not know how to try it out.

The AND NOT performer.is_bot is taken from !50 (merged)

Bug: T419916

Edited by Michael Große

Merge request reports

Loading