Add float rounding to CH usage events

Pavel Shutsinrequested to merge
528661-fix-ch-rounding into master

What does this MR do and why?

Adds rounding to float number because timestamp.to_f isn't always precise:

[1] pry(main)> Time.current.floor(3).to_f
=> 1744108603.598
[2] pry(main)> Time.current.floor(3).to_f
=> 1744108604.7180002
[3] pry(main)> Time.current.floor(3).to_f
=> 1744108606.48
[4] pry(main)> Time.current.floor(3).to_f
=> 1744108607.548
[5] pry(main)> Time.current.floor(3).to_f
=> 1744108608.4129999

As a result we still have records with microsecond values in ClickHouse. No user facing changes.

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