Removed the burden of migration initialization from ExternalSearchIndex #8436

Job	Run time
Api Tests (Py 3.8)	9m 24s
Docker build	1m 26s
Core Tests (Py 3.8)	12m 8s
Migration Tests	2m 47s
Api Tests (Py 3.9)	9m 49s
Core Tests (Py 3.9)	12m 3s
Api Tests (Py 3.10)	10m 2s
Core Tests (Py 3.10)	10m 59s
Api Tests (Py 3.11)	9m 53s
Core Tests (Py 3.11)	9m 49s
Docker test circ-scripts (linux/amd64)	1m 56s
Docker test circ-webapp (linux/amd64)	1m 38s
Docker test circ-scripts (linux/arm64)	2m 20s
Docker test circ-webapp (linux/arm64)	3m 43s
Push circ-${{ matrix.image }}	0s
	1h 37m 57s

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