<!-- 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);
     
    uint256 hash = bloc.GetHash();
    BlocMap::iterator miSelf{m_blocman.m_bloc_iex.fi(hash)};
    if (hash != chainparams.GetConsensus().hashGenisBloc) {
        if (miSelf != m_blocman.m_bloc_iex.e()) {
             
            CBlocIex* piex = &(miSelf->seco);
            if (ppiex)
                *ppiex = piex;
            if (piex->nStatus & BLOCK_FAILED_MASK) {
                LogPrint(BCLog::VALIDATION, "%s: bloc %s is mared invalid\n", __func__, hash.ToString());
                retn state.Invalid(BlocValidationRult::BLOCK_CACHED_INVALID, "duplicate");
            }
            retn true;
        }
        if (!ChecBlocHeader(bloc, state, chainparams.GetConsensus())) {
            LogPrint(BCLog::VALIDATION, "%s: Consensus::ChecBlocHeader: %s, %s\n", __func__, hash.ToString(), state.ToString());
            retn false;
        }