Be able to switch off Activities, Diagnostics and Metrics

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

The number of metrics, diagnostics and activities has been steadily increasing; including for back compat of previous depreciated diagnostics (most handled by `HostingApplicationDiagnostics`); however there is no easy way to switch this off other than completely re-writing your own WebHost (as per https://github.com/NethermindEth/nethermind/pull/8879)

### Describe the solution you'd like

Be able to switch of the diagnostic types explicitly and short circuit these paths (e.g. might just want to switch off Activity creation)

### Additional context

_No response_