upgrade to generator-jhipster v8 #671

Job	Run time
build-matrix	14s
ngx-default	19m 46s
ngx-default-additional	2m 26s
ngx-mongodb-kafka-cucumber	16m 19s
ngx-gradle-fr	12m 27s
ngx-gradle-h2disk-ws-nocache	15m 22s
ngx-webflux-mongodb	15m 8s
ngx-webflux-gradle-mongodb-oauth2	12m 29s
ngx-webflux-psql-default	14m 51s
ngx-webflux-psql-additional	9m 45s
ngx-webflux-gradle-session-h2mem-es	10m 33s
ms-ngx-oauth2-mongodb-caffeine	17m 15s
mf-ngx-eureka-jwt-psql-ehcache	19m 45s
ms-mf-ngx-consul-oauth2-neo4j	19m 47s
check-angular	1s
	3h 6m 8s

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