Merge bitcoin/bitcoin#22216: refactor: Make SetupServerArgs callable without NodeContext

493fb47c57 Make SetupServerArgs callable without NodeContext (Russell Yanofsky)

Pull request description:

  `bitcoin-gui` code needs to call `SetupServerArgs` but will not have a `NodeContext` object if it is communicating with an external `bitcoin-node` process, so this just passes `ArgsManager` directly.

  ---

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). The commit was first part of larger PR #10102.

ACKs for top commit:
  MarcoFalke:
    review ACK 493fb47c57

Tree-SHA512: 94cda4350113237976e32f1935e3602d1e6ea90c29c4434db2094be70dddf4b63702c3094385258bdf1c3e5b52c7d23bbc1f0282bdd4965557eedd5aef9a0fd4

src/test/util/setup_common.cpp

@@ -76,6 +76,7 @@ BasicTestingSetup::BasicTestingSetup(const std::string& chainName, const std::ve
     : m_path_root{fs::temp_directory_path() / "test_common_" PACKAGE_NAME / g_insecure_rand_ctx_temp_path.rand256().ToString()},
       m_args{}
 {
+    m_node.args = &gArgs;
     const std::vector<const char*> arguments = Cat(
         {
             "dummy",
@@ -94,7 +95,7 @@ BasicTestingSetup::BasicTestingSetup(const std::string& chainName, const std::ve
     gArgs.ForceSetArg("-datadir", m_path_root.string());
     gArgs.ClearPathCache();
     {
-        SetupServerArgs(m_node);
+        SetupServerArgs(*m_node.args);
         std::string error;
         const bool success{m_node.args->ParseParameters(arguments.size(), arguments.data(), error)};
         assert(success);