Merge bitcoin/bitcoin#24758: Disable the syscall sandbox for bitcoin-qt and remove gui-related syscalls

fabdf9f870 Remove gui-only syscalls (MarcoFalke)
fa0c2aa826 init: Disable syscall sandbox in the bitcoin-qt process (MarcoFalke)

Pull request description:

  It is basically impossible (and a bit out of scope) for us to maintain a sandbox for the qt library. I am not sure if it is possible to only sandbox a few threads in a process, but I doubt this will add no practical benefit anyway, so I am disabling the sandbox for the whole bitcoin-qt process.

  See also https://github.com/bitcoin/bitcoin/pull/24690#issuecomment-1084372400

ACKs for top commit:
  laanwj:
    Code review ACK fabdf9f870

Tree-SHA512: 944ded03ee25f7dfd0bfeea9c3f97f575f2d470aa03b387b07f3e3bec5cb886e4aaa17e4a9fb359d3e670e6da69adc9111673d13e6561ec55b3161bb67dfe760

src/node/interfaces.cpp

@@ -90,7 +90,7 @@ public:
     uint32_t getLogCategories() override { return LogInstance().GetCategoryMask(); }
     bool baseInitialize() override
     {
-        return AppInitBasicSetup(gArgs) && AppInitParameterInteraction(gArgs) && AppInitSanityChecks() &&
+        return AppInitBasicSetup(gArgs) && AppInitParameterInteraction(gArgs, /*use_syscall_sandbox=*/false) && AppInitSanityChecks() &&
                AppInitLockDataDirectory() && AppInitInterfaces(*m_context);
     }
     bool appInitMain(interfaces::BlockAndHeaderTipInfo* tip_info) override