Fix(ArrayInput): display validation error when validation is performed via useFormContext's trigger

[jonathanarnault]

Problem

In RA Enterprise <WizardForm />, when an array input is in the second step and the user clicks on the Next button, the array input error is not shown if it is required.

Solution

Display the error by checking if the form has an error when validation has been triggered by a user's action.

How To Test

1. make storybook
2. Go to http://localhost:9010/?path=/story/ra-ui-materialui-input-arrayinput--trigger-validation

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• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
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• The documentation is up to date

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