Fixes before 7.1 release

[thiagodeev]

• Fixes BlockWithTxHashes and BlockWithTxs methods not returning all values of pending blocks;
• Improves the tests of these methods and creates a mock scenario for the BlockWithTxs method;
• Remotions:
  • Unused parameters from mock_test.go, thus removing the warnings;
  • 'TestGetBlock' at 'provider_test.go' as the 'TestBlockWithTxHashes' already tests the BlockWithTxHashes method;
  • 'TestBlockWithTxsAndInvokeTXNV0', 'TestBlockWithTxsAndInvokeTXNV1', 'TestBlockWithTxsAndInvokeTXNV3', and 'TestBlockWithTxsAndDeployOrDeclare'. They were unified into the 'TestBlockWithTxs' test;
  • 'sepoliaBlockTxs64159.json' file. Replaced by another block with more variety of transaction types.