Renaming the main thread (e.g., the one the program spawns with) causes the name of the daemon in utilities such as "top" to show as "b-init" instead of bitcoind. This is surprising, as it doesn't show the other thread names (by default), you'd expect it to show program names.

This doesn't only affect top: killall does no longer recognize the program name
```
$ killall bitcoind
bitcoind: no process found
$ killall b-init
(no output, succesful)
```

~~In contrast to `bitcoin-qt`, which doesn't suffer from this problem because it has a separate init thread~~, initialization happens in the main thread in `bitcoind`, and it's renamed due to `util::ThreadRename("init");` in `AppInit`. If we want to name the init thread, this should only be done in `bitcoin-qt`.

(not sure when this was introduced, but #16984 made the issue more visible because ther's no bitcoin in the name anymore)
QObject(), m_node(node)
{
}
void BitcoinCore::handleRunawayException(const std::exception *e)
{
    PrintExceptionContinue(e, "Runaway exception");
    Q_EMIT runawayException(QString::fromStdString(m_node.getWarnings("gui")));
}
void BitcoinCore::initialize()
{
    try
    {
        qDebug() << __func__ << ": Running initialization in thread";
        util::ThreadRename("qt-init");
        bool rv = m_node.appInitMain();
        Q_EMIT initializeResult(rv);
    } catch (const std::exception& e) {
        handleRunawayException(&e);
    } catch (...) {
        handleRunawayException(nullptr);
    }
}
void BitcoinCore::shutdown()