fix: register OTEL metrics if it's missing

[VinozzZ]

Which problem is this PR solving?

When using OTELMetrics, Refinery previously only emits metrics if they have been registered. This is different from how LegacyMetrics works. LegacyMetrics will emit data regardless registration during startup.

This PR changes OTELMetrics to match its behavior with LegacyMetrics so that we don't accidentally create different behaviors when using these two different type of metrics

• fixes Refinery 2.9.0 OTel Metrics not sending incoming_router_* events #1455

Short description of the changes

• create a init function for each metrics type
• call init in both Register and actual metrics calls
• call register for missing router metrics data

[kentquirk]

Why this instead of making sure that we register all metrics?

[VinozzZ]

Why this instead of making sure that we register all metrics?

I haven't found a solution programmatically to make sure we register all metrics so I thought we can at least match the behavior between the two