Parameterize email recipients

[ykeremy]

:rocket:	This description was created by Ellipsis for commit dc16af5ef215c74b184fc76b837a1e7278d4bcd9

Summary:

Add email validation for recipients in SendEmailBlock and update dependencies.

Key points:

• Added email-validator dependency in pyproject.toml.
• Introduced NoValidEmailRecipient exception in skyvern/forge/sdk/workflow/exceptions.py.
• Updated SendEmailBlock in skyvern/forge/sdk/workflow/models/block.py to validate email recipients using validate_email.
• Added get_real_email_recipients method to SendEmailBlock to filter and validate recipients.
• Modified _build_email_message method in SendEmailBlock to use validated recipients.

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[ellipsis-dev[bot]]

Skipped PR review on dc16af5ef215c74b184fc76b837a1e7278d4bcd9 because no changed files had a supported extension. If you think this was in error, please contact us and we'll fix it right away.

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