ci: add email notification for failed Python unit tests

[AndreB-bot]

Summary

Adds email notification functionality to the pre-scaffolded notifications job in the Python Unit Tests workflow.

Changes

• Modified .github/workflows/testsPython.yml to send an email via dawidd6/action-send-mail@v3 when unit tests fail
• Added if: always() to ensure the notifications job runs even on upstream failure
• Email includes repository, branch, commit, author, and a direct link to the workflow run
• Logs a success message when tests pass

Secrets Required

Secret	Description
EMAIL_USERNAME	SMTP sender email address
EMAIL_PASSWORD	SMTP app password
NOTIFICATION_EMAIL	Recipient email address