<!-- 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.

for (CChainState* chainstate : WITH_LOCK(::cs_main, return chainman.GetAll())) {
        BlockValidationState state;
        if (!chainstate->ActivateBestChain(state, nullptr)) {
            std::cerr << "Failed to connect best block (" << state.ToString() << ")" << std::endl;
            goto epilogue;
        }
    }
    
    std::cout
        << "Hello! I'm going to print out some information about your datadir." << std::endl
        << "\t" << "Path: " << gArgs.GetDataDirNet() << std::endl
        << "\t" << "Reindexing: " << std::boolalpha << node::fReindex.load() << std::noboolalpha << std::endl
        << "\t" << "Snapshot Active: " << std::boolalpha << chainman.IsSnapshotActive() << std::noboolalpha << std::endl
        << "\t" << "Active Height: " << chainman.ActiveHeight() << std::endl
        << "\t" << "Active IBD: " << std::boolalpha << chainman.ActiveChainstate().IsInitialBlockDownload() << std::noboolalpha << std::endl;
    {
        CBlockIndex* tip = chainman.ActiveTip();
        if (tip) {
            std::cout << "\t" << tip->ToString() << std::endl;
        }
    }
    for (std::string line; std::getline(std::cin, line);) {
        if (line.empty()) {
            std::cerr << "Empty line found" << std::endl;
            break;
        }
        std::shared_ptr<CBlock> blockptr = std::make_shared<CBlock>();
        CBlock& block = *blockptr;
        if (!DecodeHexBlk(block, line)) {
            std::cerr << "Block decode failed" << std::endl;