<!-- 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.

assert(!maybe_load_error.has_value());
    auto maybe_verify_error = VerifyLoadedChainstate(
        *Assert(m_node.chainman),
        fReindex.load(),
        m_args.GetBoolArg("-reindex-chainstate", false),
        chainparams.GetConsensus(),
        m_args.GetIntArg("-checkblocks", DEFAULT_CHECKBLOCKS),
        m_args.GetIntArg("-checklevel", DEFAULT_CHECKLEVEL),
        static_cast<int64_t(*)()>(GetTime));
    assert(!maybe_verify_error.has_value());
    BlockValidationState state;
    if (!m_node.chainman->ActiveChainstate().ActivateBestChain(state)) {
        throw std::runtime_error(strprintf("ActivateBestChain failed. (%s)", state.ToString()));
    }
    m_node.netgroupman = std::make_unique<NetGroupManager>(std::vector<bool>());
    m_node.addrman = std::make_unique<AddrMan>(*m_node.netgroupman,
                                               false,
                                               m_node.args->GetIntArg("-checkaddrman", 0));
    m_node.banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
    m_node.connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman); 
    m_node.peerman = PeerManager::make(chainparams, *m_node.connman, *m_node.addrman,
                                       m_node.banman.get(), *m_node.chainman,
                                       *m_node.mempool, false);
    {
        CConnman::Options options;
        options.m_msgproc = m_node.peerman.get();
        m_node.connman->Init(options);
    }
}
TestChain100Setup::TestChain100Setup(const std::vector<const char*>& extra_args)