DataAnnotation added to model property 'DelegateEmails'.

[Auldrin-Possa]

JIRA link
https://hee-dls.atlassian.net/browse/DLSV2-695

Description
DataAnnotation added to model property 'DelegateEmails'. Code modified to handle email validation.

Screenshots

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Developer checks

I have:

• Run the formatter and made sure there are no IDE errors
• Written tests for the changes (accessibility tests, unit tests for controller, data services, services, view models, etc)
• Manually tested my work with and without JavaScript
• Tested any Views or partials created or changed with [Wave Chrome plugin]any valid accessibility issues
• Updated/added documentation in [Confluence]
• Updated my Jira ticket with information about other parts of the system that were touched as part of the MR and have to be sanity tested to ensure nothing’s broken
• Scanned over my own MR to ensure everything is as expected and it looks right in the browser