fix(external_services): Mask sender_email

[AnuthaDev]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Changed the type of sender_email to pii::Email in the external_services crate

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

Closes #10847

How did you test it?

Build and run router. In the logged application config, verified that the sender_email is masked.

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/external_services/src/email.rs	0% smaller
crates/external_services/src/email/ses.rs	0% smaller
crates/external_services/src/email/smtp.rs	0% smaller

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@4df0779). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10848   +/-   ##
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  Coverage        ?    6.35%           
=======================================
  Files           ?     1269           
  Lines           ?   321037           
  Branches        ?        0           
=======================================
  Hits            ?    20389           
  Misses          ?   300648           
  Partials        ?        0           

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