[v3-3-test] Restore pluggable email backend for task failure and retry alerts (#69877) - #70129

[v3-3-test] Restore pluggable email backend for task failure and retry alerts (#69877)#70129

potiuk merged 1 commit into

v3-3-testapache/airflow:v3-3-testfrom

backport-f7dec02-v3-3-testapache/airflow:backport-f7dec02-v3-3-testCopy head branch name to clipboard