.csv file export shortens timestamps to minutes granularity, should keep raw value

[Archaeopteryx]

Issue Summary

.csv file export shortens timestamps to minutes granularity, should keep raw value

Steps to Reproduce

1. Open https://sql.telemetry.mozilla.org/queries/78112
2. From the vertical three dot menu at the top right, call "Show API key".
3. Copy the url for the CSV formatted file.
4. Open a new browser tab
5. Paste the url.
6. Load the file.
7. Save it.
8. Open it.

Actual result: Timestamps don't contain information about seconds and milliseconds.
Expected result: Timestamp returned with data stored in database (compare with JSON file).

Technical details:

• Redash Version: Version: 9.0.0-beta (3e76946)