upgrade to generator-jhipster v8 #668

Job	Run time
build-matrix	16s
ngx-default	12m 28s
ngx-default-additional	3m 32s
ngx-mongodb-kafka-cucumber	5m 53s
ngx-gradle-fr	12m 35s
ngx-gradle-h2disk-ws-nocache	13m 34s
ngx-webflux-mongodb	5m 48s
ngx-webflux-gradle-mongodb-oauth2	12m 3s
ngx-webflux-psql-default	2m 57s
ngx-webflux-psql-additional	2m 52s
ngx-webflux-gradle-session-h2mem-es	2m 43s
ms-ngx-oauth2-mongodb-caffeine	19m 0s
mf-ngx-eureka-jwt-psql-ehcache	9m 53s
ms-mf-ngx-consul-oauth2-neo4j	19m 25s
check-angular	1s
	2h 3m 0s

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