Fix error status code and written unittests for Resend Email

[harshakhmk]

Description

Fixed status code, error responses for Resend Email endpoint and written unit tests

Fixes # 625

Type of Change:

• Code
• Quality Assurance
• User Interface
• Outreach
• Documentation

Code/Quality Assurance Only

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update (software upgrade on readme file)
• New feature (non-breaking change which adds functionality pre-approved by mentors)

How Has This Been Tested?

Checklist:

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-review of my own code or materials
• [x] I have commented my code or provided relevant documentation, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] Any dependent changes have been merged
• [ ] Update Postman API at /docs folder
• [x] Update Swagger documentation and the exported file at /docs folder
• [ ] Update requirements.txt

Code/Quality Assurance Only

• [x] My changes generate no new warnings
• [ ] My PR currently breaks something (fix or feature that would cause existing functionality to not work as expected)
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been published in downstream modules

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[harshakhmk]

@isabelcosta @vj-codes @devkapilbansal I have raised an MR kindly review it, let me know if there any changes

[harshakhmk]

@devkapilbansal updated the code

[harshakhmk]

I have updated the commit @devkapilbansal @isabelcosta

[isabelcosta]

@devkapilbansal thank you for pinging me for this 🙏🏾 And great work reviewing PR!

[devkapilbansal]

@harshakhmk tests are failing. Please fix them and update the code.

[vj-codes]

@harshakhmk any updates about this PR?