Log all of fleet server configuration at startup

[ph]

When debugging an issue in cloud it is useful to know with what options the fleet-server is operating at, because some options are derived from the current container size and other can be change with the fleet-server integration.

I would be good to log a single even that we can search through the log that would container the information defined in https://github.com/elastic/fleet-server/blob/3c8cd17c1370abb07f6935021d31c8204e4d16a3/internal/pkg/config/input.go

[ph]

@michalpristas @joshdover as discussed.

[joshdover]

These logs need to be sure to sanitize the configuration to avoid logging any sensitive fields like certificate private keys

[michel-laterman]

It looks like there is some existing redacting/logging of fleet-server's config (from #692 and #620). I can use the same functions in order to ensure that config is also displayed on load.

[jlind23]

@michel-laterman did we make any progress on this one?

[michel-laterman]

I have a PR that needs testing, i'll push it as a draft

[jlind23]

@michel-laterman thanks, would you mind linking it to this issue to keep track of it?