Bind to full prop namings in API v2 endpoints, pt. 2

[tom2drum]

In continuation of the issue #2374

Backend task blockscout/blockscout#10913

Starting from 6.9.0 of backend, all API v2 endpoints contains duplicates of shorthands of the props.

The general idea is to replace:

• ...tx... and ...txn... with ...transaction...
• ...num... with number.

The full set of renamings:

old prop name	new prop name	status	comment
tx_tag	transaction_tag	✅
has_error_in_internal_txs	has_error_in_internal_transactions	prop is not used
index_int_tx_desc_order	index_internal_transaction_desc_order	prop is not used
block	block_number	✅	where block number is returned, not block object: internal transaction and transaction views. Both view are used in list and single object API endpoints
tx_types	transaction_types	✅

Please bind to new props in API endpoints. The next (6.10.0) release of the backend will remove old prop names.