beefy: Increment metric and add extra log details (#5075)

This PR increments the beefy metric wrt no peers to query justification
from.
The metric is incremented when we submit a request to a known peer,
however that peer failed to provide a valid response, and there are no
further peers to query.

While at it, add a few extra details to identify the number of active
peers and cached peers, together with the request error

Part of:
- https://github.com/paritytech/polkadot-sdk/issues/4985
- https://github.com/paritytech/polkadot-sdk/issues/4925

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Signed-off-by: Alexandru Vasile <[email protected]>