fix: address `check-cfg` warnings + chores

[0x009922]

Context

Close #4993 (see context there)

I found yet another time that metrics & telemetry is broken in Iroha. This PR doesn't fix it, but disables more parts of it to remove noisy warnings. Main issue is #5134

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Checklist

• [x] I've read CONTRIBUTING.md.
• [ ] (optional) I've written unit tests for the code changes.
• [ ] All review comments have been resolved.
• [ ] All CI checks pass.