EVM Node: Fix level-related metrics at startup

Thomas Letanrequested to merge
lthms@etherlink--fix-initial-value-metrics into master

When monitoring an EVM node through its metrics, it is frequent to see the latest and confirmed levels set to 0 on startup. This is because the metrics were not systematically set ahead of starting the RPC server. This changeset fixes this by (1) moving the initialization of metrics to Evm_context so that the sequencer, observer and TE sequencer have that value correct, and (2) fixing the logic directly for the RPC node, which does not start the Evm_context worker.

This should allow not to see this anymore.

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