Validate EmailAddress1 on "To" recipients in SendEmailRequestHandler

[Copilot]

When sending an email, resolved (partyid-based) recipients in "To" must have an emailaddress1 — without this check, emails could be dispatched to entities with no email address.

Changes

• SendEmailRequestHandler: After confirming a partyid recipient exists in the DB, adds a check that the referenced entity has a non-empty emailaddress1. Throws FaultException if missing.
• TestSendEmail: Adds TestSendEmailRequestFailsWhenRecipientHasNoEmailAddress1 — creates a contact without EMailAddress1 and asserts the send request throws.

var partyEntity = db.GetEntityOrNull(partyRef);
if (partyEntity is null)
    throw new FaultException($"{partyRef.LogicalName} with Id = {partyRef.Id} does not exist");

if (string.IsNullOrEmpty(partyEntity.GetAttributeValue<string>("emailaddress1")))
    throw new FaultException($"{partyRef.LogicalName} with Id = {partyRef.Id} does not have an email address");

Original prompt

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This section details on the original issue you should resolve

<issue_title>Validate To in SendEmailRequestHandler</issue_title>
<issue_description>All references in "To" should have an "EmailAddress1"</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Validate To in SendEmailRequestHandler #312

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