feat: Add workspace removal notification email template

[Allan2000-Git]

User description

Description

This PR adds a project removal notification email template. It provides users with key information regarding the project removal, including project name and removal date.

Fixes #56

Dependencies

No new dependencies introduced.

Future Improvements

Make it consistent with Keyshade's theme.

Mentions

@rajdip-b

Screenshots of relevant screens

Developer's checklist

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-check on my work

If changes are made in the code:

• [x] I have followed the coding guidelines
• [x] My changes in code generate no new warnings
• [ ] My changes are breaking another fix/feature of the project
• [ ] I have added test cases to show that my feature works
• [x] I have added relevant screenshots in my PR
• [x] There are no UI/UX issues

Documentation Update

• [ ] This PR requires an update to the documentation at docs.keyshade.xyz
• [ ] I have made the necessary updates to the documentation, or no documentation changes are required.

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PR Type

enhancement

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Description

• Added a new projectRemoval method to the IMailService interface to handle project removal notifications.
• Implemented the projectRemoval method in MailService with an HTML email template that includes project name and removal date.
• Added a mock implementation of the projectRemoval method in MockMailService for testing purposes, logging the project removal details.

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Changes walkthrough 📝

	Relevant files
Enhancement	interface.service.ts Add `projectRemoval` method to mail service interface        apps/api/src/mail/services/interface.service.ts Added a new method projectRemoval to the IMailService interface. The method takes email, projectName, and removedOn as parameters. +6/-0      mail.service.ts Implement project removal notification email template        apps/api/src/mail/services/mail.service.ts Implemented projectRemoval method in MailService. Created an HTML email template for project removal notifications. The email includes project name and removal date. +103/-0
Tests	mock.service.ts Add mock implementation for project removal notification  apps/api/src/mail/services/mock.service.ts Added mock implementation for projectRemoval method. Logs project removal details for testing purposes. +10/-0

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