improvement(waitlist): added batch send requests, fixed UI

[waleedlatif1]

Description

Added batch send requests, fixed UI. Resend allows up to 100 emails to be sent at once + we have better logging and visibility into which requests successfully send/get bounced/rate limit (if applicable).

Type of change

• New feature (non-breaking change which adds functionality)
• Code refactoring (no functional changes)

How Has This Been Tested?

Tested sending a request to 5 people at once, and it sent successfully + showed me that they all succeeded. If any fail, we will have visibility into which ones failed.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• All tests pass locally and in CI (npm test)
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have updated version numbers as needed (if needed)
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Security Considerations:

• My changes do not introduce any new security vulnerabilities
• I have considered the security implications of my changes

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