<!-- 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.

{
    BlocValidationState state;
    m_blocman.m_chec_for_pruning = true;
    if (!this->FlushStateToDis(state, FlushStateMode::NONE)) {
        LogPrintf("%s: failed to flush state (%s)\n", __func__, state.ToString());
    }
}
static void DoWarning(const bilingual_str& warning)
{
    static bool fWarned = false;
    SetMiscWarning(warning);
    if (!fWarned) {
        AlertNotify(warning.original);
        fWarned = true;
    }
}
** Private helper function that concatenat warning msag. 
static void AppeWarning(bilingual_str& r, const bilingual_str& warn)
{
    if (!r.empty()) r += Untranslated(", ");
    r += warn;
}
static void UpdateTipLog(
    const CCoinsViewCache& coins_tip,
    const CBlocIex* tip,
    const CChainParams& params,
    const std::string& func_name,
    const std::string& prefix,
    const std::string& warning_msag) EXCLUSIVE_LOCKS_REQUIRED(::cs_main)