Delete some old migrations #1573

Job	Run time
static-analysis (8.3, cs)	50s
static-analysis (8.3, stan)	48s
static-analysis (8.3, swagger:validate)	25s
cli-tests / tests (8.2)	53s
cli-tests / tests (8.3)	56s
api-tests / tests (8.2)	1m 38s
cli-tests / tests (8.4)	1m 1s
api-tests / tests (8.3)	1m 35s
api-tests / tests (8.4)	1m 37s
unit-tests / tests (8.2)	47s
unit-tests / tests (8.3)	48s
unit-tests / tests (8.4)	47s
db-tests (maria) / db-tests (8.2)	49s
db-tests (ms) / db-tests (8.2)	1m 22s
db-tests (maria) / db-tests (8.3)	29s
db-tests (ms) / db-tests (8.3)	56s
db-tests (maria) / db-tests (8.4)	34s
db-tests (ms) / db-tests (8.4)	1m 7s
db-tests (mysql) / db-tests (8.2)	51s
db-tests (mysql) / db-tests (8.3)	39s
db-tests (mysql) / db-tests (8.4)	35s
db-tests (postgres) / db-tests (8.2)	38s
db-tests (sqlite:ci) / db-tests (8.2)	30s
db-tests (postgres) / db-tests (8.3)	1m 17s
db-tests (sqlite:ci) / db-tests (8.3)	28s
db-tests (sqlite:ci) / db-tests (8.4)	24s
db-tests (postgres) / db-tests (8.4)	30s
upload-coverage (8.3)	42s
delete-artifacts	1s
	23m 57s

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