[BOLT] Report input staleness (#79496)

It's beneficial to have uniform reporting in both `infer-stale-profile`
on and off cases, primarily for logging purposes.

Without this change, BOLT would report "input" staleness in
`infer-stale-profile=0` case (without matching), and "output" staleness
in `infer-stale-profile=1` case (after matching).

This change makes BOLT report "input" staleness in both cases. "Output"
staleness information is printed separately with "BOLT-INFO: inferred
profile..."