Add tests to ensure date sorting works, and you can't bulk import dates in an invalid format.

[samwho]

Description

This PR makes sure that date-only fields sort correctly by adding tests, and it makes sure that bulk importing rows cannot introduce invalid data into datetime fields.

Launchcontrol

• Bulk importing rows (e.g. from a CSV) now requires dates to be formatted in a strict way, e.g. date-times should be YYYY-MM-DDTHH:MM:SSZ, date-only should be YYYY-MM-DD, and time-only should be HH:MM:SS.

[linear]

BUDI-8960 Issue sorting dates when using MM/DD/YYYY

[qa-wolf]

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