[ui] Allow configuration of a scaling factor for estimate costs in Dagster Insights

[stigmarl]

What's the use case?

It should be possible to configure a scaling factor for the cost metric per unit in order to make it more convenient to reason with in the insight settings. For example, BigQuery costs some 💵 per TiB, making the cost per unit (byte) smaaaall to work with.

Also, in the user provided metrics overview, the value in the tooltip for estimated cost is rounded down to two significant decimals, which makes this harder to reason with, even though the estimated cost itself is calculated correctly.

Even though the cost for BigQuery is reasoned about in the tera scale, I imagine this could be useful for other systems as well.

Ideas of implementation

Allow users with editor access and above to set a "scaling factor" per unit for the cost in the Insight settings. This could either be as a SI prefix (tera, giga) or base 10 (10¹², 10⁹) for the unit, which would be reflected in both the calculation and other UI elements.

Additional information

No response

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