Remove artificial limitation in block production

Block production was using `anachronisticLedgerView` to request a ledger view for the leader check, and failing with `TraceNoLedgerView` if that failed to produce a ledger view. However, as part of the work on input-output-hk/ouroboros-network#1933 we realized using `anachronisticLedgerView` here is wrong, and we should use `applyChainTick` instead: there is no reason why we can't produce a block even if we are far ahead.
I have however left in the call to `anachronisticLedgerView` (soon to be `ledgerViewForecastAt`), because the consensus tests are currently failing without it. I strongly suspect that this is because of a limitation of the test infrastructure (not quite setting parameters strictly enough) rather than a true bug. We should try to remove it and update the tests.

Note however that once the hard fork timing stuff is merged, we will re-introduce a restriction: if our ledger is far behind, we can't even convert the current `UTCTime` to a `SlotNo`, and so we can't do the leader check. That might in fact reintroduce the same limitation, and fix this problem without the current artificial check.