feat!: Drop the block_structure.storage_backing_for_cache WaffleSwitch #29624

Job	Run time
collect-and-verify	4m 36s
lms-1(py=3.11,dj=pinned,mongo=7.0)	8m 52s
lms-2(py=3.11,dj=pinned,mongo=7.0)	8m 52s
lms-3(py=3.11,dj=pinned,mongo=7.0)	8m 49s
lms-4(py=3.11,dj=pinned,mongo=7.0)	8m 50s
lms-5(py=3.11,dj=pinned,mongo=7.0)	8m 51s
lms-6(py=3.11,dj=pinned,mongo=7.0)	8m 50s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 51s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 51s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 32s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 39s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 46s
cms-2(py=3.11,dj=pinned,mongo=7.0)	8m 52s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 51s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 39s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 34s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 25s
Unit tests successful	2s
coverage	0s
compile-warnings-report	0s
merge-artifacts	0s
	2h 15m 42s

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