Delete some old migrations #1572

Job	Run time
static-analysis (8.3, cs)	50s
static-analysis (8.3, stan)	52s
static-analysis (8.3, swagger:validate)	23s
api-tests / tests (8.2)	1m 51s
cli-tests / tests (8.2)	53s
api-tests / tests (8.3)	1m 37s
unit-tests / tests (8.2)	50s
cli-tests / tests (8.3)	58s
api-tests / tests (8.4)	1m 38s
unit-tests / tests (8.3)	47s
cli-tests / tests (8.4)	58s
unit-tests / tests (8.4)	48s
db-tests (maria) / db-tests (8.2)	46s
db-tests (maria) / db-tests (8.3)	33s
db-tests (ms) / db-tests (8.2)	1m 10s
db-tests (maria) / db-tests (8.4)	43s
db-tests (mysql) / db-tests (8.2)	1m 18s
db-tests (ms) / db-tests (8.3)	1m 9s
db-tests (ms) / db-tests (8.4)	55s
db-tests (mysql) / db-tests (8.3)	40s
db-tests (postgres) / db-tests (8.2)	39s
db-tests (mysql) / db-tests (8.4)	41s
db-tests (postgres) / db-tests (8.3)	34s
db-tests (postgres) / db-tests (8.4)	32s
db-tests (sqlite:ci) / db-tests (8.2)	31s
db-tests (sqlite:ci) / db-tests (8.3)	32s
db-tests (sqlite:ci) / db-tests (8.4)	42s
upload-coverage (8.3)	32s
delete-artifacts	2s
	24m 24s

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