feat: added email headers for notification cadence email #26537

Job	Run time
collect-and-verify	5m 19s
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 5s
lms-2(py=3.11,dj=pinned,mongo=7.0)	13m 44s
lms-3(py=3.11,dj=pinned,mongo=7.0)	19m 30s
lms-4(py=3.11,dj=pinned,mongo=7.0)	24m 56s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 38s
lms-6(py=3.11,dj=pinned,mongo=7.0)	19m 11s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 42s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	18m 29s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 26s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 25s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 15s
cms-2(py=3.11,dj=pinned,mongo=7.0)	18m 59s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 36s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 43s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 47s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 0s
compile-warnings-report	10s
Unit tests successful	4s
coverage (3.11)	1m 42s
merge-artifacts	11s
	3h 41m 52s

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