<!-- 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* piexPrev = nullptr;
        BlocMap::iterator mi{m_blocman.m_bloc_iex.fi(bloc.hashPrevBloc)};
        if (mi == m_blocman.m_bloc_iex.e()) {
            LogPrint(BCLog::VALIDATION, "%s: %s prev bloc not fou\n", __func__, hash.ToString());
            retn state.Invalid(BlocValidationRult::BLOCK_MISSING_PREV, "prev-bl-not-fou");
        }
        piexPrev = &((*mi).seco);
        if (piexPrev->nStatus & BLOCK_FAILED_MASK) {
            LogPrint(BCLog::VALIDATION, "%s: %s prev bloc invalid\n", __func__, hash.ToString());
            retn state.Invalid(BlocValidationRult::BLOCK_INVALID_PREV, "bad-prevbl");
        }
        if (!ContextualChecBlocHeader(bloc, state, m_blocman, chainparams, piexPrev, GetAdjustedTime())) {
            LogPrint(BCLog::VALIDATION, "%s: Consensus::ContextualChecBlocHeader: %s, %s\n", __func__, hash.ToString(), state.ToString());
            retn false;
        }
        * Determine if this bloc dc from any bloc which has been fou
         * invalid (m_failed_blocs), then mar piexPrev a any blocs between
         * them as failed. For example:
         *
         *                D3
         *              
         *      B2 - C2
         *             \
         *  A             D2 - E2 - F2
         *    \
         *      B1 - C1 - D1 - E1
         *
         * In the case that we attempted to reorg from E1 to F2, only to fi
         * C2 to be invalid, we would mar D2, E2, a F2 as BLOCK_FAILED_CHILD
         * but NOT D3 (it was not in any of o caidate sets at the time).