refactor(sso): standardize SSO identity provider query names (#10335)

Updated method, query, and variable names to align with a consistent
naming convention for fetching SSO identity providers. Added
comprehensive unit tests to validate SSO service logic, ensuring better
reliability and maintainability.

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Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-front/src/modules/settings/accounts/components/SettingsAccountsRowDropdownMenu.tsx

@@ -49,7 +49,6 @@ export const SettingsAccountsRowDropdownMenu = ({
     <>
       <Dropdown
         dropdownId={dropdownId}
-        className={className}
         dropdownPlacement="right-start"
         dropdownHotkeyScope={{ scope: dropdownId }}
         clickableComponent={