eu cloud migration tutorial update

[ivanagas]

Changes

eu cloud migration update. use replicator instead of migrator 3000.

Checklist

• [x] Titles are in sentence case
• [x] Feature names are in sentence case too
• [x] Words are spelled using American English
• [x] I have checked out our style guide

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[ivanagas]

There's a thing missing here - the fact that one needs to trigger a historical export to get historical data, unlike the Migrator that does this under the hood

@yakkomajuri maybe it is just me, but still having trouble getting historical exports to run

[lsmith77]

enabling the historical data export I got the following error shown

note I picked 1.1.2021 as a start date and I think we only started using Posthog later in the year. so this should be a date well before the first event as ever stored on our project.

[ivanagas]

@yakkomajuri ready for another look, added historical exports details.