tests, bench: Consolidate {Test,Bench}Un/LoadWallet helper

The wallet tests and benchmarks both had helper functions for loading
and unloading the wallet for the test that were almost identical.
These functions are consolidated and reused.

src/wallet/test/util.cpp

@@ -9,6 +9,7 @@
 #include <key_io.h>
 #include <streams.h>
 #include <test/util/setup_common.h>
+#include <wallet/context.h>
 #include <wallet/wallet.h>
 #include <wallet/walletdb.h>
 
@@ -45,6 +46,36 @@ std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cc
     return wallet;
 }
 
+std::shared_ptr<CWallet> TestLoadWallet(std::unique_ptr<WalletDatabase> database, WalletContext& context, uint64_t create_flags)
+{
+    bilingual_str error;
+    std::vector<bilingual_str> warnings;
+    auto wallet = CWallet::Create(context, "", std::move(database), create_flags, error, warnings);
+    NotifyWalletLoaded(context, wallet);
+    if (context.chain) {
+        wallet->postInitProcess();
+    }
+    return wallet;
+}
+
+std::shared_ptr<CWallet> TestLoadWallet(WalletContext& context)
+{
+    DatabaseOptions options;
+    options.create_flags = WALLET_FLAG_DESCRIPTORS;
+    DatabaseStatus status;
+    bilingual_str error;
+    std::vector<bilingual_str> warnings;
+    auto database = MakeWalletDatabase("", options, status, error);
+    return TestLoadWallet(std::move(database), context, options.create_flags);
+}
+
+void TestUnloadWallet(std::shared_ptr<CWallet>&& wallet)
+{
+    SyncWithValidationInterfaceQueue();
+    wallet->m_chain_notifications_handler.reset();
+    UnloadWallet(std::move(wallet));
+}
+
 std::unique_ptr<WalletDatabase> DuplicateMockDatabase(WalletDatabase& database)
 {
     return std::make_unique<MockableDatabase>(dynamic_cast<MockableDatabase&>(database).m_records);