[Execution Node] Log more system specs at startup

[fxamacker]

Problem

Changes to system specs can impact performance, so log more info (kernel version, microcode version, etc.) at startup.

E.g. for Intel CPUs, SPECTRE-BHB affects Haswell (2013) to Alder Lake (2021) and mitigations can reportedly impact performance by double-digit percents.

The Proposed Solution

Log the microcode revision, kernel version, etc. by updating logHardware() called in cmd/execution/main.go:

		Module("hardware specs", func(node *cmd.NodeConfig) error {
			hwLogger := node.Logger.With().Str("system", "hardware").Logger()
			err = logHardware(hwLogger)
			if err != nil {
				hwLogger.Error().Err(err)
			}
			return nil
		}).

[fxamacker]

Closed by #2187