This change updates the credential key generation to use a stable hash (SHA256) instead of Python's built-in hash, which can vary based on PYTHONHASHSEED. It also makes sure that temporary or exchanged OAuth2 fields are excluded from the key calculation. I also added when saving credentials, a copy of the AuthConfig is used to avoid modifying the original shared AuthConfig instance with user-specific exchanged credentials.
Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 864599326