feat: replaced button and heading tags in email digest content #29314

Job	Run time
collect-and-verify	4m 28s
lms-1(py=3.11,dj=pinned,mongo=7.0)	9m 54s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 44s
lms-3(py=3.11,dj=pinned,mongo=7.0)	14m 47s
lms-4(py=3.11,dj=pinned,mongo=7.0)	20m 11s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 56s
lms-6(py=3.11,dj=pinned,mongo=7.0)	16m 1s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 41s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 33s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 19s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 59s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 11s
cms-2(py=3.11,dj=pinned,mongo=7.0)	12m 14s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 32s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 12s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 43s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 48s
compile-warnings-report	8s
Unit tests successful	4s
coverage (3.11)	1m 42s
merge-artifacts	6s
	3h 3m 13s

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