Bump max instance RAM to 1024 GiB

[david-crespo]

Closes #2824

Turns out we don't have any tests exercising these limits, and while testing it I noticed that we do something really annoying on instance create if you type in too big of a RAM amount. Unlike in the resize modal, where we correctly show an error on blur, on instance create we just silently change the value to the max.

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[david-crespo]

The minValue and maxValue props can be used to limit the entered value to a specific range. The value will be clamped when the user blurs the input field.

https://react-spectrum.adobe.com/react-aria/useNumberField.html#minimum-and-maximum-values

The difference between instance create and resize is that we are not passing max in the resize one (relying solely on the explicit validation function to validate on blur) so it is not doing the clamping. The downside here is that the up button doesn't get disabled when you reach the max, which is cute. If forced to choose, I'd rather have validate on blur than disabled button, but I'll see if we can get both.

[david-crespo]

Tolerable IMO even though the up button (and up arrow key) isn't disabled. At these numbers you're probably not using them anyway.

[david-crespo]

Merging as net improvement, we can figure out the other thing later if we care