[ECO-2286] Fix the incorrect chart bar times

[xbtmatt]

Description

The chart is currently not dividing the time returned by a function that takes in a bigint of microseconds, so it thinks it's nearly the year 50,000.

During the big update for indexer v2, the server-env.ts file lost its import "server-only" directive at the top of the file. Currently it can be accidentally imported to client files. I've also fixed that

• [x] Fix the calculation in time error
• [x] Add the server-only import to the server environment variables file, move it to a folder for server actions that we may use later

Testing

I'll add unit tests for some of this logic later, but for now we just have to visually ensure it's correct. It's extremely obviously wrong at the moment, so just check that the latest bar on the chart is '24 and not the year 50447 (will display as '47) and that means it's working correctly.

Checklist

• [x] Did you update relevant documentation?
• [x] Did you add tests to cover new code or a fixed issue?
• [x] Did you update the changelog?
• [x] Did you check all checkboxes from the linked Linear task?

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