chore: delete unused tags_count from LibraryXBlockMetadata (#35510) #29634

Job	Run time
collect-and-verify	3m 57s
lms-1(py=3.11,dj=pinned,mongo=7.0)	10m 4s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 37s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 10s
lms-4(py=3.11,dj=pinned,mongo=7.0)	20m 16s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 53s
lms-6(py=3.11,dj=pinned,mongo=7.0)	15m 43s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	10m 48s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 21s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 29s
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 52s
cms-2(py=3.11,dj=pinned,mongo=7.0)	12m 40s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 39s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 32s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 41s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 43s
Unit tests successful	2s
compile-warnings-report	13s
coverage (3.11)	1m 42s
merge-artifacts	13s
	3h 1m 14s

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