feat(libs/emails): Add retry with backoff for email-sender
commit 02e8ba386ce1e20efcb83c4c264f6924c2952ab5 Author: Nicholas ShirleyDate: Sat Dec 13 13:38:10 2025 -0700 feat(libs/emails): Add retry with backoff for email-sender Because: - We want to enable retrying an email send if the send fails This Commit: - Adds a new retryWithBackoff for accounts-email-sender - Adds configuration to change maxRetries, backoffMs, and ignoreTempaltes - Adds tests for new functionality Closes: FXA-12591