Add exponential backoff retry logic in Twilio detector

[shahzadhaider1]

Summary

Adds retry logic with exponential backoff to the Twilio detector by switching from SaneHttpClient to RetryableHTTPClient.

Changes

• Replace common.SaneHttpClient() with common.RetryableHTTPClient() in the Twilio detector

Behavior

• Retries up to 3 times on transient failures (429, 5xx, network errors)
• Exponential backoff between retries

Checklist:

• Tests passing (make test-community)?
• Lint passing (make lint this requires golangci-lint)?

[nabeelalam]

Short and sweet!