Submission wizard dataset description length warning

[luistoptal]

User story

As a author in the submissioj wizard
I want to be warned when I enter a dataset description (abstract) that is too long
So that I dont provide a description that is too long

Acceptance criteria

Given I am submitting a dataset via the submission wizard
When I enter the dataset description
And it is over 250 words in length
Then I see a warning to tell me its getting too long

Given I am submitting a dataset via the submission wizard
When I enter the dataset description
And it is over 500 words in length
Then I am prevented from submitting the dataset with the reason shown (Description is too long)

Additional Info

This is a split of ticket #2177 that includes the stories related to the submission wizard. See comments in #2177

Product Backlog Item Ready Checklist

• Business value is clearly articulated
• Item is understood enough by the IT team so it can make an informed decision as to whether it can complete this item
• Dependencies are identified and no external dependencies would block this item from being completed
• At the time of the scheduled sprint, the IT team has the appropriate composition to complete this item
• This item is estimated and small enough to comfortably be completed in one sprint
• Acceptance criteria are clear and testable
• Performance criteria, if any, are defined and testable
• The Scrum team understands how to demonstrate this item at the sprint review

Product Backlog Item Done Checklist

• Item(s) in increment pass all Acceptance Criteria
• Code is refactored to best practices and coding standards
• Documentation is updated as needed
• Data security has not been compromised (with particular reference to the personal information we hold in GigaDB)
• No deviation from the team technology stack and software architecture has been introduced
• The product is in a releasable state (i.e. the increment has not broken anything)