Revert use of decodeErrorInfo for WALLETS_SIGNATURES_03.

This particular test happens to use `rawRequest` instead of `request`.
Whereas the `request` function attempts to decode the response into a
JSON `Value`, the `rawRequest` function does not perform any decoding.

This causes the subsequent `decodeErrorInfo` to fail with:

```
  uncaught exception: ErrorCall
   decodeErrorInfo: Expected a 'ClientError', but encountered something else: Left (RawClientError "{\"code\":\"no_such_wallet\",\"info\":{\"wallet_id\":\"acab1951ad1ef5808eb9756b02d1ff85caf0e702\"},\"message\":\"I couldn't find a wallet with the given id: acab1951ad1ef5808eb9756b02d1ff85caf0e702\"}")
   CallStack (from HasCallStack):
     error, called at framework/Test/Integration/Framework/DSL.hs:742:13 in cardano-wallet-integration-2024.5.5-KhWmuWPIqBp7pTemTBE3I2-framework:Test.Integration.Framework.DSL
     decodeErrorInfo, called at scenarios/Test/Integration/Scenario/API/Shelley/Wallets.hs:1495:9 in cardano-wallet-integration-2024.5.5-AcHGWrd1jBGKoKhY01VJRG-scenarios:Test.Integration.Scenario.API.Shelley.Wallets
```

lib/integration/scenarios/Test/Integration/Scenario/API/Shelley/Wallets.hs

@@ -178,6 +178,7 @@ import Test.Integration.Framework.TestData
     ( arabicWalletName
     , errMsg403WrongMnemonic
     , errMsg403WrongPass
+    , errMsg404NoWallet
     , errMsg406
     , errMsg415
     , kanjiWalletName
@@ -1489,11 +1490,12 @@ spec = describe "SHELLEY_WALLETS" $ do
             (Headers [(HTTP.hAccept, "*/*"), (HTTP.hContentType, "application/json")])
             (Json payload)
 
+        -- TODO: ADP-3306
+        -- Use `expectErrorInfo` instead of `expectErrorMessage` here:
         verify r
             [ expectResponseCode HTTP.status404
+            , expectErrorMessage (errMsg404NoWallet $ w ^. walletId)
             ]
-        decodeErrorInfo r `shouldBe`
-            NoSuchWallet (ApiErrorNoSuchWallet (w ^. #id))
 
     it "BYRON_WALLETS_UTXO -\
         \ Cannot show Byron wal utxo with shelley ep (404)" $ \ctx -> runResourceT $ do