chore: improve insert transaction response

[mfrankovi]

Add additional info in insert transaction response

[Copilot]

Pull Request Overview

This PR updates the insert transaction response to include additional status messages by changing the return type from TransactionStatus to a pair containing TransactionStatus and a string message.

• Updated tests to check the first element of the returned pair.
• Refactored transaction_queue and transaction_manager implementations and their header declarations to provide detailed error messages.
• Adjusted network packet handler logic to use the new response format.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/full_node_test.cpp	Updated test comparison to use the first element of the returned pair.
libraries/core_libs/network/src/tarcap/packets_handlers/latest/transaction_packet_handler.cpp	Refactored status checks for the new response pair format.
libraries/core_libs/consensus/src/transaction/transaction_queue.cpp	Changed insert() return type to include a message and updated error responses.
libraries/core_libs/consensus/src/transaction/transaction_manager.cpp	Adjusted insertValidatedTransaction() to return status-message pair and updated condition handling accordingly.
libraries/core_libs/consensus/include/transaction/transaction_queue.hpp	Updated function signature to reflect the new return type.
libraries/core_libs/consensus/include/transaction/transaction_manager.hpp	Updated function signature to reflect the new return type.