feat: Pass abort signal to fetch in email validation provider

[hariombalhara]

What does this PR do?

This PR addresses the GitHub comment from @Udit-takkar on PR #24196 by implementing an abort mechanism for email validation requests. The changes ensure that network requests to the ZeroBounce API can be properly cancelled when the timeout is reached, preventing resource leaks.

Key Changes:

• Modified IEmailValidationProviderService interface to accept an object parameter {request, abortSignal} instead of separate arguments
• Updated ZeroBounceEmailValidationProviderService to pass the AbortSignal to the fetch call
• Updated EmailValidationService to provide the abort signal when calling the provider
• Renamed parameter from signal to abortSignal for clarity
• Updated all test cases to match the new object parameter syntax

Link to Devin run: https://app.devin.ai/sessions/c45ece61f03b45a39e358c8be7acf0d4
Requested by: @hariombalhara

Visual Demo (For contributors especially)

N/A - This is an internal API change with no visual components.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - Internal API change with no documentation impact.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

Environment Setup:

• Set ZEROBOUNCE_API_KEY environment variable for integration testing
• No special test data required

Key Test Scenarios:

1. Timeout behavior: Verify that when email validation times out (after 3000ms), the fetch request is properly aborted
2. Normal operation: Ensure email validation still works correctly when requests complete within the timeout
3. Error handling: Confirm that AbortError is handled appropriately when signals are aborted

Testing Commands:

# Run unit tests
TZ=UTC yarn test packages/features/emailValidation/lib/service/

# Type checking
yarn type-check:ci --force

Checklist

⚠️ Important for Review:

• Verify this is the only implementation of IEmailValidationProviderService in the codebase
• Search for any other callers of validateEmail method that might have been missed
• Test abort functionality - manually verify that network requests are cancelled when timeout occurs
• Confirm backward compatibility - ensure optional abortSignal parameter works when not provided

Technical Details:

• Interface breaking change is intentional and necessary for proper abort handling
• Object parameter pattern {request, abortSignal} is more extensible than separate arguments
• All existing tests updated to match new signature
• Parameter renamed from signal to abortSignal for clarity about its purpose with fetch requests

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch devin/pass-abort-signal-1759742148

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2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
cal	Ignored			Oct 6, 2025 11:06am
cal-eu	Ignored			Oct 6, 2025 11:06am