[Infra] Unify routes error handling on the BE

[mykolaharmash]

Some Infra routes have error handling logic "built-in" (e.g. infra), some use a wrapper helper function (e.g. custom_dashboards), and some don't have error handling at all (e.g. inventory_metadata).

Would be good to have a centralized error handling on a framework level, for example inside the registerRoute function.

[smith]

Moving back to backlog for now.

[roshan-elastic]

Thanks for this, I've reviewed this but in order to prioritise, more info needed in order to understand user value for this.

Are you able to summarise what this value this brings to the user?