<!-- 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.

AssertLockHeld(::cs_main);
    m_prune_locks[name] = lock_info;
}
CBlockIndex* BlockManager::InsertBlockIndex(const uint256& hash)
{
    AssertLockHeld(cs_main);
    if (hash.IsNull()) {
        return nullptr;
    }
    const auto [mi, inserted]{m_block_index.try_emplace(hash)};
    CBlockIndex* pindex = &(*mi).second;
    if (inserted) {
        pindex->phashBlock = &((*mi).first);
    }
    return pindex;
}
bool BlockManager::LoadBlockIndex(const Consensus::Params& consensus_params)
{
    if (!m_block_tree_db->LoadBlockIndexGuts(consensus_params, [this](const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return this->InsertBlockIndex(hash); })) {
        return false;
    }
    
    std::vector<CBlockIndex*> vSortedByHeight{GetAllBlockIndices()};
    std::sort(vSortedByHeight.begin(), vSortedByHeight.end(),
              CBlockIndexHeightOnlyComparator());
    for (CBlockIndex* pindex : vSortedByHeight) {