Fields do not validate field length

[mattbrailsford]

Which Umbraco Forms version are you using? (Please write the exact version, example: 13.4.0)

13.6.0

Which Umbraco version are you using? (Please write the exact version, example: 13.5.2)

13.0.0

Issue summary

If a field type exceeds the maximum length of the db column for the field types data type this should be captured in the ValidateField call.

Specifics

Hidden fields use a FieldDataType.String which is persisted in the UFRecordDataString table, in which the value column is limited to 255 characters. However there's no corresponding validation rule for this in the field type.

We should update the base ValidateField to automatically validate field values for their expected data types length and throw appropriate validation errors.

Steps to reproduce

• Create a form with a text string input
• Enter more than 225 character (the data types DB limit)
• See DB exception rather than Validation exception

Expected result / actual result

I'd expect a validation exception to be thrown

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This item has been added to our backlog AB#61364