Fix: credit_balances does not exist

[1yam]

Fix issue:

1. credit_balance got replaced by credit_history & unit test mocked replaced with more cohérent value (from staging instead of fake data generated by claude)

[github-actions]

"summary": "This PR involves a renaming of a variable from credit_balances to credit_history within the CreditsHistoryResponse class. This is a straightforward change that does not alter the functionality of the code but improves clarity and consistency. No significant risks are introduced, and the change is unlikely to introduce bugs. The associated test cases have been updated to reflect this change, ensuring that the code continues to function as expected.",
"highlights": [
{
"line": "credit_balances",
"comment": "Old variable name"
},
{
"line": "credit_history",
"comment": "New variable name"
},
{
"line": "assert len(response.credit_balances) == 3",
"comment": "Old assertion for credit balances length"
},
{
"line": "assert len(response.credit_history) == 2",
"comment": "New assertion for credit history length"
}
]
}

[nesitor]

🚀