feat!: Drop the block_structure.storage_backing_for_cache WaffleSwitch #27143

Job	Run time
lms-1(py=3.11,dj=pinned,mongo=7.0)	12m 37s
collect-and-verify	5m 1s
lms-2(py=3.11,dj=pinned,mongo=7.0)	12m 20s
lms-3(py=3.11,dj=pinned,mongo=7.0)	12m 23s
lms-4(py=3.11,dj=pinned,mongo=7.0)	12m 33s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 1s
lms-6(py=3.11,dj=pinned,mongo=7.0)	11m 30s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 13s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	10m 59s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	11m 26s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 30s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 17s
cms-2(py=3.11,dj=pinned,mongo=7.0)	12m 33s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 10s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 45s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 23s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 45s
Unit tests successful	4s
coverage	0s
compile-warnings-report	0s
merge-artifacts	0s
	2h 54m 30s

Provide feedback