Merge #16366: init: Use InitError for all errors in bitcoind/qt

fa6f402bde Call node->initError instead of InitError from GUI code (Russell Yanofsky)
fad2502240 init: Use InitError for all errors in bitcoind/qt (MarcoFalke)

Pull request description:

  Using the same InitError for startup error in the daemon and the gui makes it possible to run the tests with the gui again:

  ```sh
  BITCOIND=bitcoin-qt ./test/functional/test_runner.py feature_includeconf feature_config_args

ACKs for top commit:
  hebasto:
    ACK fa6f402bde
  ryanofsky:
    utACK fa6f402bde. Only changes since last review are removing more includes and adding Node::initError method to avoid accessing node `InitError` function and global variables from GUI code.

Tree-SHA512: bd19e08dcea4019dfe40356bc5c63cb583cefed54b6c9dcfb82f1b5b00308d8e2b363549afcaea5e93bf83864dbe0917400c3b70f43a8a5bdff45c9cd34cc294

src/interfaces/node.cpp

@@ -54,6 +54,7 @@ class NodeImpl : public Node
 {
 public:
     NodeImpl() { m_interfaces.chain = MakeChain(); }
+    void initError(const std::string& message) override { InitError(message); }
     bool parseParameters(int argc, const char* const argv[], std::string& error) override
     {
         return gArgs.ParseParameters(argc, argv, error);

src/interfaces/node.h

@@ -38,6 +38,9 @@ class Node
 public:
     virtual ~Node() {}
 
+    //! Send init error.
+    virtual void initError(const std::string& message) = 0;
+
     //! Set command line arguments.
     virtual bool parseParameters(int argc, const char* const argv[], std::string& error) = 0;