fix: don't raise CraftValidationErrors in validators #600
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The rule is this: in validators, always raise the types that Pydantic expects (ValueErrors, AssertionErrors, TypeError, and subclasses of these). This allows Pydantic to capture all errors and group them into a single ValidationError, which we can then convert into a single CraftValidationError in from_yaml_data(). This provides a more uniform UI for the reporting of validation errors on the project.