GenAIInfra: Enhance Observability

[joshuayao]

Request from Malini:

Enhanced H/W monitoring: add CPU/HPU/Memory/Storage/Network metrics exporters and dashboards

[joshuayao]

Confirmed with Malini, we can close this feature.
PRs:
CPU/memory/network/storage dashboard: #190
CPU detailed dashboard: #171
HPU dashboard: #161