Merge bitcoin/bitcoin#31616: init,log: Unify block index log line

e04be37 init,log: Unify block index and chainstate loading log line (Lőrinc)

Pull request description:

  The line has been present since the beginning.

  Removed redundant duration as well since it can be recovered from the timestamps.

  Example logs before the change:
  ```
  2025-01-07T11:58:33Z Verification progress: 99%
  2025-01-07T11:58:33Z Verification: No coin database inconsistencies in last 6 blocks (18905 transactions)
  2025-01-07T11:58:33Z  block index           31892ms
  2025-01-07T11:58:33Z Setting NODE_NETWORK on non-prune mode
  ```

ACKs for top commit:
  maflcko:
    lgtm ACK e04be37
  TheCharlatan:
    ACK e04be37
  danielabrozzoni:
    tACK e04be37
  BrandonOdiwuor:
    Code Review ACK e04be37

Tree-SHA512: cbe4569a17f56ff23e829b837a083c2f730cc490b47bee3bac12126e2257e0ba9ebe9b4384deb03203a0a60aac3b8d283c5d31a6d0481635ba011ac6e2c61ad1

Author: fanquake

src/init.cpp

@@ -1245,7 +1245,6 @@ static ChainstateLoadResult InitAndLoadChainstate(
             "", CClientUIInterface::MSG_ERROR);
     };
     uiInterface.InitMessage(_("Loading block index…").translated);
-    const auto load_block_index_start_time{SteadyClock::now()};
     auto catch_exceptions = [](auto&& f) {
         try {
             return f();
@@ -1263,7 +1262,7 @@ static ChainstateLoadResult InitAndLoadChainstate(
         }
         std::tie(status, error) = catch_exceptions([&] { return VerifyLoadedChainstate(chainman, options); });
         if (status == node::ChainstateLoadStatus::SUCCESS) {
-            LogPrintf(" block index %15dms\n", Ticks<std::chrono::milliseconds>(SteadyClock::now() - load_block_index_start_time));
+            LogInfo("Block index and chainstate loaded");
         }
     }
     return {status, error};