Timeseries Visual Builder - DST shift in historic data

[alexwizp]

Fix: #33006

Summary

In the timeseries visualization of visual builder we compare different series from this week, last week (1w) and 2 weeks (2w) ago, i.e. using "offset series time" in the options of the metric
After the daylight saving time shift in the US suddenly our historic data (offsetted timeseries) got also shifted and is displayed with 1 hour offset. The current data after the shift is displaying fine.
Reason is probably the series when selected for the last 7 days uses the same timestamps on the X-Axis for this week as for last week and old data gets converted to the new "time zone".

Note: Timestamps are UTC everywhere (code, server, ES?), data is from Europe, so now DST shift involved here.

Steps to reproduce:

Create multiple timeseries in visual builder which spans over the DST shift
Observe how peaks in historic data shift by 1 hour

Checklist

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[elasticmachine]

Pinging @elastic/kibana-app

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request

[PhilippBaranovskiy]

🐸👍

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request

[emmacunningham]

tested locally & code lgtm