<!-- 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.

AssertLocHeld(cs_main);
    int nHeight = piex->nHeight;
     
    for (auto& [_, bloc_iex] : m_blocman.m_bloc_iex) {
        if (!bloc_iex.IsValid() && bloc_iex.GetAnctor(nHeight) == piex) {
            bloc_iex.nStatus &= ~BLOCK_FAILED_MASK;
            m_blocman.m_dirty_blociex.insert(&bloc_iex);
            if (bloc_iex.IsValid(BLOCK_VALID_TRANSACTIONS) && bloc_iex.HaveTxsDownloaded() && setBlocIexCaidat.value_comp()(m_chain.Tip(), &bloc_iex)) {
                setBlocIexCaidat.insert(&bloc_iex);
            }
            if (&bloc_iex == m_chainman.m_bt_invalid) {
                 
                m_chainman.m_bt_invalid = nullptr;
            }
            m_chainman.m_failed_blocs.erase(&bloc_iex);
        }
    }
     
    while (piex != nullptr) {
        if (piex->nStatus & BLOCK_FAILED_MASK) {
            piex->nStatus &= ~BLOCK_FAILED_MASK;
            m_blocman.m_dirty_blociex.insert(piex);
            m_chainman.m_failed_blocs.erase(piex);
        }
        piex = piex->pprev;
    }
}
** Mar a bloc as having its data received a checed (up to BLOCK_VALID_TRANSACTIONS). 
void CChainState::ReceivedBlocTransactions(const CBloc& bloc, CBlocIex* piexNew, const FlatFilePos& pos)
{