fix: remove django-linear-migrations

Removes django-linear-migrations from requirements-dev.txt, INSTALLED_APPS,
and deletes max_migration.txt. The tool caused startup failures when the
package was not installed but DD_DEBUG=True.

Author: valentijnscholten

dojo/db_migrations/max_migration.txt

@@ -2116,14 +2116,7 @@ def saml2_attrib_map_format(din):
 
     MIDDLEWARE = ["debug_toolbar.middleware.DebugToolbarMiddleware", *MIDDLEWARE]
 
-# Linear migrations for development
-# Helps avoid merge migration conflicts by tracking the latest migration
 if DEBUG:
-    INSTALLED_APPS = (
-        "django_linear_migrations",  # Must be before dojo to override makemigrations
-        *INSTALLED_APPS,
-    )
-
     def show_toolbar(request):
         return True
 

dojo/settings/settings.dist.py

@@ -13,6 +13,3 @@ parameterized==0.9.0
 
 # Development file watching (hot reload)
 watchdog[watchmedo]==6.0.0
-
-# Migration management - allows for easy rebasing via manage.py rebase_migration
-django-linear-migrations==2.19.0