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/locales/en-US/core.js

@@ -83,8 +83,6 @@ export default {
         'Are you sure you want to remove this manager from the project?',
       areYouSureYouWantToRemoveThisMemberFromBoard:
         'Are you sure you want to remove this member from the board?',
-      areYouSureYouWantToUnlinkSsoFromThisUser:
-        'Are you sure you want to unlink SSO from this user? This will allow the user to log in with a password.',
       assignAsOwner_title: 'Assign As Owner',
       atLeastOneListMustBePresent: 'At least one list must be present',
       attachment: 'Attachment',
@@ -332,7 +330,6 @@ export default {
       turnOffRecentCardHighlighting: 'Turn off recent card highlighting',
       typeNameToConfirm: 'Type the name to confirm.',
       typeTitleToConfirm: 'Type the title to confirm.',
-      unlinkSso_title: 'Inlink SSO',
       unsavedChanges: 'Unsaved changes',
       uploadFailedFileIsTooBig: 'Upload failed: File is too big.',
       uploadFailedNotEnoughStorageSpace: 'Upload failed: Not enough storage space.',
@@ -499,8 +496,6 @@ export default {
       start: 'Start',
       stop: 'Stop',
       subscribe: 'Subscribe',
-      unlinkSso: 'Unlink SSO',
-      unlinkSso_title: 'Unlink SSO',
       unsubscribe: 'Unsubscribe',
       uploadNewAvatar: 'Upload new avatar',
       uploadNewImage: 'Upload new image',

client/src/locales/en-US/login.js

@@ -16,7 +16,6 @@ export default {
       poweredByPlanka: 'Powered by <1>PLANKA</1>',
       serverConnectionFailed: 'Server connection failed',
       unknownError: 'Unknown error, try again later',
-      useSingleSignOn: 'Use single sign-on',
       usernameAlreadyInUse: 'Username already in use',
       whoops_title: 'Whoops!',
     },
@@ -24,11 +23,9 @@ export default {
     action: {
       cancelAndClose: 'Cancel and close',
       continue: 'Continue',
-      debugSso: 'Debug SSO',
       goBack: 'Go back',
       goHome: 'Go home',
       logIn: 'Log in',
-      logInWithSso: 'Log in with SSO',
     },
   },
 };