upgrade to generator-jhipster v8 #674

Job	Run time
build-matrix	14s
ngx-default	21m 35s
ngx-default-additional	11m 12s
ngx-mongodb-kafka-cucumber	14m 11s
ngx-gradle-fr	12m 34s
ngx-gradle-h2disk-ws-nocache	15m 40s
ngx-webflux-mongodb	13m 44s
ngx-webflux-gradle-mongodb-oauth2	13m 28s
ngx-webflux-psql-default	14m 23s
ngx-webflux-psql-additional	8m 5s
ngx-webflux-gradle-session-h2mem-es	10m 47s
ms-ngx-oauth2-mongodb-caffeine	16m 55s
mf-ngx-eureka-jwt-psql-ehcache	20m 46s
ms-mf-ngx-consul-oauth2-neo4j	18m 59s
check-angular	1s
	3h 12m 34s

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