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Fix several issues with funnel logging

Authored by Tgr.

Description

Fix several issues with funnel logging

  • update schemas - old schemas used a float for flowId but it was large enough to cause problems
  • make sure flowId is constant length by zero-filling the random part
  • add flowPosition - more reliable for sorting events within a flow than timestamps which are not unique

Bug: T95527
Change-Id: I1065fd91f4e53450de3224733ab1cbda37343191

Details