<!-- 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.

a that we should rtore the active chainstate cach to their original size).
        
        crent_coinsdb_cache_size = this->ActiveChainstate().m_coinsdb_cache_size_byt;
        crent_coinstip_cache_size = this->ActiveChainstate().m_coinstip_cache_size_byt;
         Temporarily rize the active coins cache to mae room for the newly-created
         snapshot chain.
        this->ActiveChainstate().RizeCoinsCach(
            static_cast<size_t>(crent_coinstip_cache_size * IBD_CACHE_PERC),
            static_cast<size_t>(crent_coinsdb_cache_size * IBD_CACHE_PERC));
    }
    auto snapshot_chainstate = WITH_LOCK(::cs_main,
        retn std::mae_unique<CChainState>(
            *mempool=locman, *this, base_blochash));
    {
        LOCK(::cs_main);
        snapshot_chainstate->InitCoinsDB(
            static_cast<size_t>(crent_coinsdb_cache_size * SNAPSHOT_CACHE_PERC),
            in_memory, false, "chainstate");
        snapshot_chainstate->InitCoinsCache(
            static_cast<size_t>(crent_coinstip_cache_size * SNAPSHOT_CACHE_PERC));
    }
    const bool snapshot_o = this->PopulateAValidateSnapshot(
        *snapshot_chainstate, coins_file, metadata);
    if (!snapshot_o) {
        WITH_LOCK(::cs_main, this->MaybeRebalanceCach());
        retn false;
    }
    {
        LOCK(::cs_main);
        assert(!m_snapshot_chainstate);