wallet: Delete LegacySPKM

Deletes LegacyScriptPubKeyMan and related tests

Best reviewed with `git diff --patience` or `git diff --histogram`

src/wallet/test/scriptpubkeyman_tests.cpp

@@ -15,32 +15,6 @@
 namespace wallet {
 BOOST_FIXTURE_TEST_SUITE(scriptpubkeyman_tests, BasicTestingSetup)
 
-// Test LegacyScriptPubKeyMan::CanProvide behavior, making sure it returns true
-// for recognized scripts even when keys may not be available for signing.
-BOOST_AUTO_TEST_CASE(CanProvide)
-{
-    // Set up wallet and keyman variables.
-    CWallet wallet(m_node.chain.get(), "", CreateMockableWalletDatabase());
-    LegacyScriptPubKeyMan& keyman = *wallet.GetOrCreateLegacyScriptPubKeyMan();
-
-    // Make a 1 of 2 multisig script
-    std::vector<CKey> keys(2);
-    std::vector<CPubKey> pubkeys;
-    for (CKey& key : keys) {
-        key.MakeNewKey(true);
-        pubkeys.emplace_back(key.GetPubKey());
-    }
-    CScript multisig_script = GetScriptForMultisig(1, pubkeys);
-    CScript p2sh_script = GetScriptForDestination(ScriptHash(multisig_script));
-    SignatureData data;
-
-    // Verify the p2sh(multisig) script is not recognized until the multisig
-    // script is added to the keystore to make it solvable
-    BOOST_CHECK(!keyman.CanProvide(p2sh_script, data));
-    keyman.AddCScript(multisig_script);
-    BOOST_CHECK(keyman.CanProvide(p2sh_script, data));
-}
-
 BOOST_AUTO_TEST_CASE(DescriptorScriptPubKeyManTests)
 {
     std::unique_ptr<interfaces::Chain>& chain = m_node.chain;