cluster-receiver: Make cluster-receiver dependent on flutter-cluster-dashboard

cluster-receiver: Make cluster-receiver dependent on flutter-cluster-dashboard

We might not have a gRPC channel in ready state when starting
cluster-receiver app, so delay that until flutter-cluster-dashboard
starts.

Bug-AGL: SPEC-5235
Change-Id: I4fb56c7a95024923c9fa90d9050ac6f97da13c74
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/30647
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account