Merge #20211: Use -Wswitch for TxoutType where possible

fa650ca7f1 Use -Wswitch for TxoutType where possible (MarcoFalke)
fa59e0b5bd test: Add missing script_standard_Solver_success cases (MarcoFalke)

Pull request description:

  This removes unused `default:` cases for all `switch` statements on `TxoutType` and adds the cases (`MULTISIG`, `NULL_DATA`, `NONSTANDARD`) to `ExtractDestination` for clarity.

  Also, the compiler is now able to use `-Wswitch`.

ACKs for top commit:
  practicalswift:
    cr ACK fa650ca7f1: patch looks correct and `assert(false);` is better than UB :)
  hebasto:
    ACK fa650ca7f1, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 282458b6523bd8923a0c0f5c423d1db2dce2a2d1b1d1dae455415c6fc995bb41ce82c1f9b0a1c0dcc6d874d171e04c30eca585f147582f52c7048c140358630a

src/wallet/scriptpubkeyman.cpp

@@ -94,8 +94,7 @@ IsMineResult IsMineInner(const LegacyScriptPubKeyMan& keystore, const CScript& s
     TxoutType whichType = Solver(scriptPubKey, vSolutions);
 
     CKeyID keyID;
-    switch (whichType)
-    {
+    switch (whichType) {
     case TxoutType::NONSTANDARD:
     case TxoutType::NULL_DATA:
     case TxoutType::WITNESS_UNKNOWN:
@@ -194,7 +193,7 @@ IsMineResult IsMineInner(const LegacyScriptPubKeyMan& keystore, const CScript& s
         }
         break;
     }
-    }
+    } // no default case, so the compiler can warn about missing cases
 
     if (ret == IsMineResult::NO && keystore.HaveWatchOnly(scriptPubKey)) {
         ret = std::max(ret, IsMineResult::WATCH_ONLY);