Remove unexported error cases

Drop test cases for errors not exported by `bitcoinkernel.h` (`TxInputIndex`, `SpentOutputsMismatch`, `InvalidFlags`) to align with C API capabilities.

Author: stringintech

testdata/script_verify_errors.json

@@ -80,96 +80,6 @@
         }
       }
     },
-    {
-      "id": "error_tx_input_index_out_of_bounds",
-      "description": "Input index exceeds the number of inputs in the transaction",
-      "method": "btck_script_pubkey_verify",
-      "params": {
-        "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-        "amount": 0,
-        "tx_to": "02000000013f7cebd65c27431a90bba7f796914fe8cc2ddfc3f2cbd6f7e5f2fc854534da95000000006b483045022100de1ac3bcdfb0332207c4a91f3832bd2c2915840165f876ab47c5f8996b971c3602201c6c053d750fadde599e6f5c4e1963df0f01fc0d97815e8157e3d59fe09ca30d012103699b464d1d8bc9e47d4fb1cdaa89a1c5783d68363c4dbc4b524ed3d857148617feffffff02836d3c01000000001976a914fc25d6d5c94003bf5b0c7b640a248e2c637fcfb088ac7ada8202000000001976a914fbed3d9b11183209a57999d54d59f67c019e756c88ac6acb0700",
-        "input_index": 999,
-        "flags": [
-          "btck_ScriptVerificationFlags_P2SH",
-          "btck_ScriptVerificationFlags_DERSIG",
-          "btck_ScriptVerificationFlags_NULLDUMMY",
-          "btck_ScriptVerificationFlags_CHECKLOCKTIMEVERIFY",
-          "btck_ScriptVerificationFlags_CHECKSEQUENCEVERIFY",
-          "btck_ScriptVerificationFlags_WITNESS"
-        ],
-        "spent_outputs": [
-          {
-            "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-            "amount": 100000
-          }
-        ]
-      },
-      "expected": {
-        "error": {
-          "type": "ScriptVerify",
-          "variant": "TxInputIndex"
-        }
-      }
-    },
-    {
-      "id": "error_spent_outputs_mismatch",
-      "description": "Spent outputs array length doesn't match transaction input count",
-      "method": "btck_script_pubkey_verify",
-      "params": {
-        "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-        "amount": 0,
-        "tx_to": "02000000013f7cebd65c27431a90bba7f796914fe8cc2ddfc3f2cbd6f7e5f2fc854534da95000000006b483045022100de1ac3bcdfb0332207c4a91f3832bd2c2915840165f876ab47c5f8996b971c3602201c6c053d750fadde599e6f5c4e1963df0f01fc0d97815e8157e3d59fe09ca30d012103699b464d1d8bc9e47d4fb1cdaa89a1c5783d68363c4dbc4b524ed3d857148617feffffff02836d3c01000000001976a914fc25d6d5c94003bf5b0c7b640a248e2c637fcfb088ac7ada8202000000001976a914fbed3d9b11183209a57999d54d59f67c019e756c88ac6acb0700",
-        "input_index": 0,
-        "flags": [
-          "btck_ScriptVerificationFlags_P2SH",
-          "btck_ScriptVerificationFlags_DERSIG",
-          "btck_ScriptVerificationFlags_NULLDUMMY",
-          "btck_ScriptVerificationFlags_CHECKLOCKTIMEVERIFY",
-          "btck_ScriptVerificationFlags_CHECKSEQUENCEVERIFY",
-          "btck_ScriptVerificationFlags_WITNESS"
-        ],
-        "spent_outputs": [
-          {
-            "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-            "amount": 100000
-          },
-          {
-            "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-            "amount": 100000
-          }
-        ]
-      },
-      "expected": {
-        "error": {
-          "type": "ScriptVerify",
-          "variant": "SpentOutputsMismatch"
-        }
-      }
-    },
-    {
-      "id": "error_invalid_flags",
-      "description": "Verification flags contain invalid bits",
-      "method": "btck_script_pubkey_verify",
-      "params": {
-        "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-        "amount": 0,
-        "tx_to": "02000000013f7cebd65c27431a90bba7f796914fe8cc2ddfc3f2cbd6f7e5f2fc854534da95000000006b483045022100de1ac3bcdfb0332207c4a91f3832bd2c2915840165f876ab47c5f8996b971c3602201c6c053d750fadde599e6f5c4e1963df0f01fc0d97815e8157e3d59fe09ca30d012103699b464d1d8bc9e47d4fb1cdaa89a1c5783d68363c4dbc4b524ed3d857148617feffffff02836d3c01000000001976a914fc25d6d5c94003bf5b0c7b640a248e2c637fcfb088ac7ada8202000000001976a914fbed3d9b11183209a57999d54d59f67c019e756c88ac6acb0700",
-        "input_index": 0,
-        "flags": 4294967295,
-        "spent_outputs": [
-          {
-            "script_pubkey": "76a9144bfbaf6afb76cc5771bc6404810d1cc041a6933988ac",
-            "amount": 100000
-          }
-        ]
-      },
-      "expected": {
-        "error": {
-          "type": "ScriptVerify",
-          "variant": "InvalidFlags"
-        }
-      }
-    },
     {
       "id": "error_invalid_flags_combination",
       "description": "VERIFY_WITNESS flag requires P2SH flag to be set as well",