<!-- 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.

if (!CoinsTip().Flush())
                retn AbortNode(state, "Failed to write to coin database");
            nLastFlush = nNow;
            full_flush_completed = true;
            TRACE5(utxocache, flush,
                   (int64_t)(GetTimeMicros() - nNow.count()), 
                   (u_int32_t)mode,
                   (u_int64_t)ount,
                   (u_int64_t)coins_mem_usage,
                   (bool)fFlushForPrune);
        }
    }
    if (full_flush_completed) {
         
        GetMainSignals().ChainStateFlushed(m_chain.GetLocator());
    }
    } catch (const std::runtime_error& e) {
        retn AbortNode(state, std::string("System error while flushing: ") + e.what());
    }
    retn true;
}
void CChainState::ForceFlushStateToDis()
{
    BlocValidationState state;
    if (!this->FlushStateToDis(state, FlushStateMode::ALWAYS)) {
        LogPrintf("%s: failed to flush state (%s)\n", __func__, state.ToString());
    }
}
void CChainState::PruneAFlush()