fix: configure pending operation test mode

[DenisCarriere]

Summary

• configure the internal-transaction test helper to explicitly use the Geth JSON-RPC variant required by transaction-level pending operations
• restore both affected application configurations after each test
• keep production import behavior unchanged

Root cause

The two new transaction-pending-operation tests only disabled Geth block tracing. Under Filecoin and RSK CI builds, the active JSON-RPC variant remained Filecoin or RSK, so PendingOperationsHelper correctly selected block-level pending operations. The tests inserted transaction-level pending operations instead, causing their traces to be filtered out.

Validation

• mix format
• Filecoin: affected Explorer test file, 24 tests, 0 failures
• RSK: affected Explorer test file, 24 tests, 0 failures
• project compilation completed under both Filecoin and RSK configurations
• git diff --check