upgrade to generator-jhipster v8 #672

Job	Run time
build-matrix	8s
ngx-default	21m 21s
ngx-default-additional	2m 59s
ngx-mongodb-kafka-cucumber	14m 15s
ngx-gradle-fr	12m 39s
ngx-gradle-h2disk-ws-nocache	14m 5s
ngx-webflux-mongodb	13m 18s
ngx-webflux-gradle-mongodb-oauth2	12m 30s
ngx-webflux-psql-default	14m 46s
ngx-webflux-psql-additional	8m 52s
ngx-webflux-gradle-session-h2mem-es	10m 33s
ms-ngx-oauth2-mongodb-caffeine	16m 28s
mf-ngx-eureka-jwt-psql-ehcache	21m 53s
ms-mf-ngx-consul-oauth2-neo4j	19m 16s
check-angular	1s
	3h 3m 4s

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