feat: Remove OIDC and SSO support

Existing SSO accounts have no local password, so the migration
deactivates them before dropping is_sso_user and the
identity_provider_user table.

client/src/components/common/AdministrationModal/UsersPane/ActionsStep.jsx

@@ -32,7 +32,6 @@ const StepTypes = {
   EDIT_PASSWORD: 'EDIT_PASSWORD',
   EDIT_ROLE: 'EDIT_ROLE',
   API_KEY: 'API_KEY',
-  UNLINK_SSO: 'UNLINK_SSO',
   ACTIVATE: 'ACTIVATE',
   DEACTIVATE: 'DEACTIVATE',
   DELETE: 'DELETE',
@@ -61,16 +60,6 @@ const ActionsStep = React.memo(({ userId, onClose }) => {
     [userId, dispatch],
   );
 
-  const handleUnlinkSsoConfirm = useCallback(() => {
-    dispatch(
-      entryActions.updateUser(userId, {
-        isSsoUser: false,
-      }),
-    );
-
-    onClose();
-  }, [userId, onClose, dispatch]);
-
   const handleActivateConfirm = useCallback(() => {
     dispatch(
       entryActions.updateUser(userId, {
@@ -123,10 +112,6 @@ const ActionsStep = React.memo(({ userId, onClose }) => {
     openStep(StepTypes.API_KEY);
   }, [openStep]);
 
-  const handleUnlinkSsoClick = useCallback(() => {
-    openStep(StepTypes.UNLINK_SSO);
-  }, [openStep]);
-
   const handleActivateClick = useCallback(() => {
     openStep(StepTypes.ACTIVATE);
   }, [openStep]);
@@ -165,16 +150,6 @@ const ActionsStep = React.memo(({ userId, onClose }) => {
         );
       case StepTypes.API_KEY:
         return <ApiKeyStep userId={userId} onBack={handleBack} onClose={onClose} />;
-      case StepTypes.UNLINK_SSO:
-        return (
-          <ConfirmationStep
-            title="common.unlinkSso"
-            content="common.areYouSureYouWantToUnlinkSsoFromThisUser"
-            buttonContent="action.unlinkSso"
-            onConfirm={handleUnlinkSsoConfirm}
-            onBack={handleBack}
-          />
-        );
       case StepTypes.ACTIVATE:
         return (
           <ConfirmationStep
@@ -271,14 +246,6 @@ const ActionsStep = React.memo(({ userId, onClose }) => {
               context: 'title',
             })}
           </Menu.Item>
-          {user.isSsoUser && !user.lockedFieldNames.includes('isSsoUser') && !isCurrentUser && (
-            <Menu.Item className={styles.menuItem} onClick={handleUnlinkSsoClick}>
-              <Icon name="unlink" className={styles.menuItemIcon} />
-              {t('action.unlinkSso', {
-                context: 'title',
-              })}
-            </Menu.Item>
-          )}
           {!isCurrentUser && (
             <>
               <Menu.Item