Merge bitcoin/bitcoin#30399: test: Add arguments for creating a slimmer TestingSetup

f46b220256 fuzz: Use BasicTestingSetup for coins_view target (TheCharlatan)
9e2a723d5d test: Add arguments for creating a slimmer setup (TheCharlatan)

Pull request description:

  This adds arguments to some of the testing setup constructors for creating an environment without networking and a validation interface. This is useful for improving the performance of the utxo snapshot fuzz test,  which constructs a new TestingSetup on each iteration.

  Using this slimmed down `TestingSetup` in future might also make the tests a bit faster when run in aggregate.

ACKs for top commit:
  maflcko:
    review ACK f46b220256
  dergoegge:
    utACK f46b220256

Tree-SHA512: 9dc62512b127b781fc9e2d8ef2b5a9b06ebb927a8294b6d872001c553984a7eb1f348e0257b32435b34b5505b5d0323f73bdd572a673da272d3e1e8538ab49d6

src/test/fuzz/coins_view.cpp

@@ -27,7 +27,6 @@
 #include <vector>
 
 namespace {
-const TestingSetup* g_setup;
 const Coin EMPTY_COIN{};
 
 bool operator==(const Coin& a, const Coin& b)
@@ -39,8 +38,7 @@ bool operator==(const Coin& a, const Coin& b)
 
 void initialize_coins_view()
 {
-    static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
-    g_setup = testing_setup.get();
+    static const auto testing_setup = MakeNoLogFileContext<>();
 }
 
 FUZZ_TARGET(coins_view, .init = initialize_coins_view)

src/test/fuzz/utxo_snapshot.cpp

@@ -31,7 +31,13 @@ void initialize_chain()
 FUZZ_TARGET(utxo_snapshot, .init = initialize_chain)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
-    std::unique_ptr<const TestingSetup> setup{MakeNoLogFileContext<const TestingSetup>()};
+    std::unique_ptr<const TestingSetup> setup{
+        MakeNoLogFileContext<const TestingSetup>(
+            ChainType::REGTEST,
+            TestOpts{
+                .setup_net = false,
+                .setup_validation_interface = false,
+            })};
     const auto& node = setup->m_node;
     auto& chainman{*node.chainman};