feat(nextcloud): add support of imaginary an externalPreviewProvider #1240

Job	Run time
changes	8s
changes	8s
lint	38s
lint	1m 1s
test	0s
summary	4s
summary	6s
test (Default - no custom values)	1m 48s
test (PostgreSQL Enabled, --helm-extra-set-args "--values charts/nextcloud/test-values/postgresql...	2m 29s
test (Nginx Enabled, --helm-extra-set-args "--values charts/nextcloud/test-values/nginx.yaml")	1m 50s
test (Horizontal Pod Autoscaling Enabled, --helm-extra-set-args "--values charts/nextcloud/test-v...	1m 52s
test (S3 Enabled as Primary Storage, --namespace nextcloud --skip-clean-up --helm-extra-set-args ...	2m 35s
test (Imaginary Enabled, --namespace nextcloud --skip-clean-up --helm-extra-set-args "--create-na...	1m 49s
	14m 28s

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