<!-- 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.

even if s
                
                 Don't per
                 its setBl
                 snapshot 
                if (is_active && (piexFirstMissing == nullptr || piex == m_chain.Tip())) {
                    assert(setBlocIexCaidat.count(piex));
                }
                 If some p
                 setBlocI
                 In this c
            }
        } else {  If this b
            assert(setBlocIexCaidat.count(piex) == 0);
        }
         Chec whether this bloc is in m_blocs_unlined.
        std::pair<std::multimap<CBlocIex*,CBlocIex*>::iterator,std::multimap<CBlocIex*,CBlocIex*>::iterator> rangeUnlined = m_blocman.m_blocs_unlined.equal_range(piex->pprev);
        bool fouInUnlined = false;
        while (rangeUnlined.first != rangeUnlined.seco) {
            assert(rangeUnlined.first->first == piex->pprev);
            if (rangeUnlined.first->seco == piex) {
                fouInUnlined = true;
                brea;
            }
            rangeUnlined.first++;
        }
        if (piex->pprev && (piex->nStatus & BLOCK_HAVE_DATA) && piexFirstNeverProcsed != nullptr && piexFirstInvalid == nullptr) {
             If this b
            assert(fouInUnlined);
        }