Merge bitcoin/bitcoin#32593: wallet, rpc: Move (Un)LockCoin WalletBatch creation out of RPC

6135e0553e wallet, rpc: Move (Un)LockCoin WalletBatch creation out of RPC (Ava Chow)

Pull request description:

  If the locked coin needs to be persisted to the wallet database, insteead of having the RPC figure out when to create a WalletBatch and having LockCoin's behavior depend on it, have LockCoin take whether to persist as a parameter so it makes the batch.

  Since unlocking a persisted locked coin requires a database write as well, we need to track whether the locked coin was persisted to the wallet database so that it can erase the locked coin when necessary.

  Keeping track of whether a locked coin was persisted is also useful information for future PRs.

  Split from #32489

ACKs for top commit:
  rkrux:
    ACK 6135e05
  Sjors:
    ACK 6135e0553e
  w0xlt:
    ACK https://github.com/bitcoin/bitcoin/pull/32593/commits/6135e0553e6e58fcf506700991fa178f2c50a266

Tree-SHA512: 0e2367fc4d50c62ec41443374b64c4c5ecf679998677df47fb8776cfb44704713bc45547e32e96cd30d1dbed766f5d333efb6f10eb0e71271606638e07e61a01

src/wallet/interfaces.cpp

@@ -249,14 +249,12 @@ public:
     bool lockCoin(const COutPoint& output, const bool write_to_db) override
     {
         LOCK(m_wallet->cs_wallet);
-        std::unique_ptr<WalletBatch> batch = write_to_db ? std::make_unique<WalletBatch>(m_wallet->GetDatabase()) : nullptr;
-        return m_wallet->LockCoin(output, batch.get());
+        return m_wallet->LockCoin(output, write_to_db);
     }
     bool unlockCoin(const COutPoint& output) override
     {
         LOCK(m_wallet->cs_wallet);
-        std::unique_ptr<WalletBatch> batch = std::make_unique<WalletBatch>(m_wallet->GetDatabase());
-        return m_wallet->UnlockCoin(output, batch.get());
+        return m_wallet->UnlockCoin(output);
     }
     bool isLockedCoin(const COutPoint& output) override
     {