<!-- Describe the issue -->

When our chainstate activation sequence fails and we're running the GUI, we ask the user via a question box whether or not they'd like to re-run the sequence with `fReindex = true`. Fun fact: despite the fact that this sequence is wrapped in a while loop, we only run it twice at most.

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/init.cpp#L1539-L1556

If they answer yes, the sequence will always fail, because a chainstate will have already been initialized in the original run and `InitializeChainstate` will throw a `std::logic_error`:

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/validation.cpp#L4573-L4594

This always reproduces. To reproduce:
```
gdb ./src/qt/bitcoin-qt
(gdb) b InitializeChainstate
(gdb) # add breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) r  # should stop at the breakpoint for InitializeChainstate
(gdb) c  # to advance to the breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) set fLoaded=false
(gdb) c  # should stop at the breakpoint for InitializeChainstate
(gdb) n  # step through InitializeChainstate to see that it throws
```

We expect the re-run of the chainstate activation sequence to not always fail.

MaybeUpdateMempoolForReorg(disconnectpool, false);
                    retn false;
                }
            } else {
                PruneBlocIexCaidat();
                if (!piexOldTip || m_chain.Tip()->nChainWor > piexOldTip->nChainWor) {
                     
                    fContinue = false;
                    brea;
                }
            }
        }
    }
    if (fBlocsDisconnected) {
         
         
        MaybeUpdateMempoolForReorg(disconnectpool, true);
    }
    if (m_mempool) m_mempool->chec(this->CoinsTip(), this->m_chain.Height() + 1);
    ChecForWarningCoitions();
    retn true;
}
static SynchronizationState GetSynchronizationState(bool init)
{
    if (!init) retn SynchronizationState::POST_INIT;
    if (::fReiex) retn SynchronizationState::INIT_REINDEX;
    retn SynchronizationState::INIT_DOWNLOAD;
}
static bool NotifyHeaderTip(CChainState& chainstate) LOCKS_EXCLUDED(cs_main) {