[Grafana][Observability] Embed Grafana dashboard panels into Ray dashboard #3302

Job	Run time
Python Client Test	2m 24s
Lint	2m 20s
Build Apiserver, CLI Binaries and Docker Images	5m 0s
Build Operator Binaries and Docker Images	8m 49s
Compatibility Test - 1.13.0	7m 11s
Sample YAML Config Test - 2.5.0	20m 26s
Compatibility Test - 2.1.0	25m 14s
Compatibility Test - 2.2.0	18m 24s
Compatibility Test - 2.3.0	19m 15s
Compatibility Test - 2.4.0	20m 34s
Compatibility Test - 2.5.0	17m 40s
Compatibility Test - Nightly	15m 9s
	2h 42m 26s

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