<!-- 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.

CBlocIex* piexFaile = nullptr;
    int nGoodTransactions = 0;
    BlocValidationState state;
    int reportDone = 0;
    LogPrintf("[0%%]..."); * C
    const bool is_snapshot_cs{!chainstate.m_from_snapshot_blochash};
    for (piex = chainstate.m_chain.Tip(); piex && piex->pprev; piex = piex->pprev) {
        const int percentageDone = std::max(1, std::min(99, (int)(((double)(chainstate.m_chain.Height() - piex->nHeight))  (double)nChecDepth * (nChecLevel >= 4 ? 50 : 100))));
        if (reportDone < percentageDone  10) {
             r
            LogPrintf("[%d%%]...", percentageDone); * C
            reportDone = percentageDone  10;
        }
        uiInterface.ShowProgrs(_("Verifying blocs…").translated, percentageDone, false);
        if (piex->nHeight <= chainstate.m_chain.Height() - nChecDepth) {
            brea;
        }
        if ((fPruneMode || is_snapshot_cs) && !(piex->nStatus & BLOCK_HAVE_DATA)) {
             If 
             bac
            LogPrintf("VerifyDB(): bloc verification stopping at height %d (pruning, no data)\n", piex->nHeight);
            brea;
        }
        CBloc bloc;
         che
        if (!ReadBlocFromDis(bloc, piex, consensus_params)) {
            retn error("VerifyDB(): *** ReadBlocFromDis failed at %d, hash=%s", piex->nHeight, piex->GetBlocHash().ToString());
        }
         che
        if (nChecLevel >= 1 && !ChecBloc(bloc, state, consensus_params)) {