fix: confusing prompt name error messages

[aditya-mitra]

body.name seems confusing as it can also mean the prompt body - updated it to show a more useful error message

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Latest commit: 67c2464

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[walker-tx]

Thank you for your PR @aditya-mitra!

It looks like the prompt name regex was modified to shorten the allowable input length. Would you explain why you've done this, or revert it back to 128 chars please?

[walker-tx]

Would you share a bit about why the character limit has been changed here?

[aditya-mitra]

Sure. body.Name has validation of limit 40 here

gram/server/gen/http/templates/server/types.go

Lines 2747 to 2751 in 67c2464

	if body.Name != nil {
	if utf8.RuneCountInString(*body.Name) > 40 {
	err = goa.MergeErrors(err, goa.InvalidLengthError("body.name", *body.Name, utf8.RuneCountInString(*body.Name), 40, false))
	}
	}