Port rpc write api method tests to Sepolia

[CHr15F0x]

By default these tests are ignored, nevertheless they rely on goerli which leads to fails rn:

failures:
    v04::method::add_declare_transaction::tests::duplicate_transaction
    v04::method::add_declare_transaction::tests::duplicate_v3_transaction
    v04::method::add_declare_transaction::tests::insufficient_account_balance
    v04::method::add_declare_transaction::tests::insufficient_max_fee
    v04::method::add_deploy_account_transaction::tests::duplicate_transaction
    v04::method::add_deploy_account_transaction::tests::duplicate_v3_transaction
    v04::method::add_invoke_transaction::tests::duplicate_transaction
    v04::method::add_invoke_transaction::tests::duplicate_v3_transaction
    v06::method::add_declare_transaction::tests::duplicate_transaction
    v06::method::add_declare_transaction::tests::duplicate_v3_transaction
    v06::method::add_declare_transaction::tests::insufficient_account_balance
    v06::method::add_declare_transaction::tests::insufficient_max_fee
    v06::method::add_deploy_account_transaction::tests::duplicate_transaction
    v06::method::add_deploy_account_transaction::tests::duplicate_v3_transaction
    v06::method::add_invoke_transaction::tests::duplicate_transaction
    v06::method::add_invoke_transaction::tests::duplicate_v3_transaction

Imo it does make sense to wait with fixing this issue until at least v0.4 is dropped.