chore: Grafana panel for monitoring remaining RLN proofs per epoch #5745

Job	Run time
changes	4s
test-ubuntu-22.04	32m 30s
build-ubuntu-22.04	21m 15s
test-macos-13	30m 57s
build-macos-13	16m 43s
build-docker-image / docker-build-ubuntu-22.04	5m 2s
js-waku-node / node	6h 0m 13s
js-waku-node-optional / node	1m 11s
Lint	38s
	7h 48m 33s

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